JP5860988B1 - Ottoman equipment - Google Patents

Abstract

A footrest can be operated without separately providing an operating means. In an ottoman device including a footrest, a link mechanism 20R, and a lock means 30, the link mechanism 20R includes at least four links and a joint shaft, and the lock means 30 is fixed to a link 21a. An internal tooth member 31, an external tooth member 32 attached to the link 21 b in a swingable state around a position shifted from the joint shaft 22 a, and an external tooth biasing member 33 are configured. The internal tooth member 31 and the external tooth member 32 include retracting cam mechanisms 31d and 32d for retracting the external tooth member 32 to the retracted position when the footrest tries to rotate upward beyond the upper limit of the use angle. Return cam mechanisms 31e and 32e are provided for returning the external tooth member 32 to the meshing position when the footrest that rotates downward with the member 32 in the retracted position reaches the vicinity of the retracted position. [Selection] Figure 5

Description

  The present invention relates to an ottoman device that can be stored in a lower portion of a seat of a vehicle or the like.

  FIG. 2 of Patent Document 1 shows a footrest (see reference numeral 11 in the figure) for placing a foot, and the footrest is supported by the seat in a state where the footrest can be pulled out from a retracted position below the seat to a fully deployed position in front of the seat. An ottoman device including a link mechanism (see reference numeral 12 in the figure) and locking means (see reference numeral 13 in the figure) for preventing the footrest that has received a load from descending is described. In the ottoman device of Patent Document 1, the lock means is a joint shaft (see reference numerals 12g to 12n in FIG. 2) for connecting the links constituting the link mechanism (see reference numerals 12a to 12f in FIG. 2 of the reference document). One of the joint shafts (see reference numeral 12m in the figure) uses a so-called “lock spring” in which a coil spring (see reference numeral 13b in the figure) is externally fitted in a tightened state. It also serves as an angle adjustment mechanism that can adjust the angle.

  However, in the ottoman device of Patent Document 1, when the footrest is to be turned downward, the lock spring (see reference numeral 16 in FIG. 2) is operated to loosen the lock spring (the lock spring is the one joint). It was necessary to be able to rotate about the axis). That is, the ottoman device of Patent Document 1 has a problem that the number of members increases because it is necessary to provide operation means, and the manufacturing cost is difficult to suppress. In addition, the ottoman device of Patent Document 1 has a problem that it becomes difficult to operate the footrest because the footrest needs to be pushed down by the opposite hand or foot while operating the operating means by hand. Another conventional ottoman device (an ottoman device other than Patent Document 1) is also provided with some operation member for adjusting the position of the footrest, and has the same problem as the ottoman device of Patent Document 1. For example, in the ottoman device shown in FIG. 5 of Patent Document 2, an operating means (see reference numeral 23 in the figure) is provided on the front side of the seat.

  Further, as shown in FIG. 5 of Patent Document 2, most of the conventional ottoman devices are those in which the operation member is attached to the seat side, but the manufacture of the ottoman device, the manufacture of the seat, and the ottoman device for the seat. It was common for the installation of to be performed at another factory. For this reason, many conventional ottoman devices have a problem that the design and manufacture of the ottoman devices cannot be completed only by the factory that manufactures the ottoman devices.

JP 2012-218568 A JP 2006-198104 A

  The present invention has been made in order to solve the above-described problems, and it is possible to operate a footrest without separately providing an operation means, and to reduce the number of parts of the ottoman device and to suppress its manufacturing cost. It is what. It is also an object of the present invention to allow the ottoman device design and manufacture to be completed at the ottoman device manufacturing plant alone.

The above issues
A footrest for placing your feet,
A link mechanism for supporting the footrest on the seat in a state where the footrest can be pulled out from a retracted position below the seat to a fully deployed position in front of the seat;
Locking means to prevent the footrest from falling under load,
With
The locking means is an ottoman device that also serves as an angle adjustment mechanism that can adjust the use angle of the footrest,
Link mechanism
At least four links,
At least four joint shafts for connecting the links in a relatively rotatable manner;
Consists of
The locking means
An internal gear member having a plurality of internal teeth on a part of the inner periphery and fixed directly or indirectly to one of the two links connected to each other via one joint shaft; ,
An external tooth member having a plurality of external teeth on a part of the outer periphery and attached to the other link of the two links in a state of being swingable around a position shifted from the one joint axis; ,
An external tooth biasing member for biasing the external tooth member inserted in the internal tooth member;
And consisting of
For internal tooth member and external tooth member,
The footrest consists of a pair of cams that come into contact with each other when the footrest tries to rotate upward beyond the upper limit of the use angle, and the contact causes the external teeth member to retract to a retracted position where the external teeth do not mesh with the internal teeth. A cam mechanism;
A pair of cams that come into contact with each other when the footrest that rotates downward with the external tooth member in the retracted position reaches the vicinity of the retracted position, the external tooth meshes with the internal tooth by the contact. A return cam mechanism comprising a pair of cams that return to the meshing position;
This is solved by providing an ottoman device characterized in that is provided.

Here, the “inner teeth” and “external teeth” have a so-called ratchet structure. In the meshed state where the inner teeth and the outer teeth mesh with each other, the inner teeth and the outer teeth rotate to one side (in the ottoman device of the present invention, the footrest is (Rotation when moving downward or rearward), while maintaining the state of being engaged with each other, the rotation to one side is restricted, and the rotation to the other (the ottoman device of the present invention, the footrest is outer teeth members its swing center for the rotation) for moving upward or forward (Fig. 5 and see C ₂ in FIG. 6) times the meshing swings around it deviates to the other Motion is allowed. In addition, “the retracting cam mechanism and the return cam mechanism are provided on the inner tooth member and the outer tooth member” means that the retracting cam mechanism and the return cam mechanism are directly connected to the inner tooth member and the outer tooth member. Not only the case of providing, but also the case of providing indirectly through another member (for example, a connecting material described later) fixed to the internal tooth member or the external tooth member is included. Furthermore, the “large number” in the “external teeth” means the number that secures the contact area between the external teeth and the internal teeth that can withstand the compressive load applied to the ratchet structure, calculated from the lock strength required for the ottoman device. It means usually 2 or more or 3 or more, and in many cases 4 or more. Furthermore, “many” in the “inner teeth” means the same number or more than the outer teeth. The number of internal teeth is appropriately determined in consideration of the required number of use positions (the number of adjustment steps of the use angle of the footrest). In addition, in the structure which concerns on the external tooth and internal tooth employ | adopted with the ottoman apparatus of this invention, the contact area of an external tooth and an internal tooth can be ensured efficiently, and the plate | board thickness of an external tooth member or an internal tooth member can be made thin. Therefore, the ratchet structure can be reduced in weight.

  As described above, the ottoman device of the present invention employs a ratchet structure with internal teeth and external teeth as the locking means, and the retract cam mechanism and the return cam mechanism function integrally as the footrest rotates. By doing so, the footrest can be stored and the angle of use can be adjusted without separately providing an operating means. In addition, since the ottoman device of the present invention does not have a separate operation means, it is possible to complete the design and manufacture of the ottoman device independently without requiring the operation of attaching the operation means of the ottoman device to the seat. It is possible. Furthermore, since the ottoman device of the present invention has a structure in which a large number of internal teeth and external teeth mesh when the footrest is in the use position (use angle), the plate thickness of the internal teeth member and external tooth members is reduced. It is possible to do it, and it is lightweight and excellent in safety.

In the ottoman device of the present invention,
Of the pair of tooth surfaces of the internal and external teeth, the tooth surface on the side receiving the downward load with respect to the direction perpendicular to the straight line connecting the center of the tooth surface on the side receiving the downward load and the swing center of the external tooth member And the angle α made by
It is preferable that an angle β formed by the tooth surface on the side receiving the lower load with respect to a direction perpendicular to a straight line connecting the center of the tooth surface on the lower load side and the arrangement center of the internal teeth is 20 ° or more.
By setting the angle α to 13 ° or more, the external teeth can slip relative to the internal teeth when an abnormal load is applied to the footrest. For this reason, when an abnormal load is applied, it is possible to prevent damage to the ottoman device, such as preventing the link, external teeth, internal teeth and the like from being deformed or broken.
On the other hand, by setting the angle β to 20 ° or more, the outer teeth will not slip with respect to the inner teeth at the load plus alpha level applied to the inner teeth and the outer teeth when the legs are normally placed on the footrest. Is possible.

  By the way, as described above, the ottoman device of the present invention has a structure in which the footrest can be rotated upward even in the meshing state in which the inner teeth and the outer teeth mesh with each other. Otherwise, there is a risk that the footrest in the use position may malfunction or rattle due to vibration or the like. Further, there is a possibility that the footrest in the retracted position jumps forward due to sudden braking or the like. For this reason, when the footrest is in the use position and in the retracted position, a rotation resistance torque is applied by a damper or the like between two specific links connected to each other via a specific joint shaft. It is preferable to prevent this. Specifically, it is preferable that the rotational resistance torque acting between the specific two links be larger when the footrest is in the fully deployed position or the retracted position than when the footrest is in another position. .

As a method other than using the damper, there is a method using a spring as follows.
That is,
While the footrest is pulled from the retracted position to the fully deployed position, the angle φ formed by the specific two links connected to each other via the specific joint axis is set to be displaced by approximately 90 °,
The two links are urged to a predetermined position in each of the two specific links in a direction to reduce the angle φ (in this case, the two specific links are regarded as the two specific links). When the angle φ decreases, the footrest moves in the retracted direction is selected.) Or, the two links are expanded to urge the angle φ to increase (in this case, the specific 2 Connect the two ends of the malfunction prevention spring to prevent the footrest from malfunctioning by selecting the link that moves the footrest in the retracted direction when the angle φ made by them increases. In addition to the case of direct connection, including the case of indirect connection through other members fixed to the two links.
An angle θ formed by a line segment connecting one end portion of the malfunction prevention spring and the specific joint shaft and a line segment connecting one end portion and the other end portion of the malfunction prevention spring is approximately 90 when the footrest is in the retracted position. It is preferable that the angle is.
The configuration using the above-described spring can be used in combination with the configuration using the above-described damper.

  Here, “substantially 90 °” is usually 80 to 100 °. Thereby, when the footrest is in the retracted position, it is possible to make it easier for the biasing force of the malfunction preventing spring to be applied to the two specific links. When the footrest is in the retracted position, the displacement amount of the malfunction prevention spring is the smallest and the biasing force of the malfunction prevention spring is the weakest. Therefore, the angle θ when the footrest is in the retracted position is set to approximately 90 °. Thus, it is preferable that the biasing force of the malfunction preventing spring is approximated to the force biasing the footrest downward (in the retracting direction).

  In the ottoman device of the present invention, the link mechanism is provided in a pair of left and right, and a specific link to which the internal gear member in one link mechanism is fixed and a link facing the specific link in the other link mechanism are connected to each other. It is preferable to connect with. As a result, the rigidity of the entire link mechanism can be increased and the footrest can be supported more stably. The connecting material can also be used as a portion for connecting one end or the other end of the above-described malfunction prevention spring.

  As described above, according to the present invention, it is possible to operate the footrest without separately providing an operating means, and it is possible to reduce the number of parts of the ottoman device and to suppress the manufacturing cost. It is also possible to complete the design and manufacture of the ottoman device at the ottoman device manufacturing plant alone.

It is the front perspective view showing an example of the ottoman device of the first embodiment concerning the present invention. In the ottoman device of the first embodiment according to the present invention, it is a side view showing the ottoman device when the footrest is in the storage position. In the ottoman apparatus of 1st embodiment which concerns on this invention, it is the side view which showed the ottoman apparatus when a footrest exists in a use lower limit position. In the ottoman device of the first embodiment according to the present invention, it is a side view showing the ottoman device when the footrest is in the fully deployed position (use upper limit position). It is the front perspective view which disassembled and showed the locking means of the ottoman device of the first embodiment concerning the present invention. It is the side view which showed the locking means in each step of the ottoman apparatus of 1st embodiment which concerns on this invention. It is the back perspective view showing the ottoman device of the second embodiment concerning the present invention. It is the back perspective view which showed the state which decomposed | disassembled the damper in the ottoman apparatus of the 2nd embodiment which concerns on this invention. It is sectional drawing which showed the state which cut | disconnected the damper in the ottoman apparatus of the 2nd embodiment which concerns on this invention by the plane containing the centerline of a brake drum. It is the side view which showed the damper periphery in the ottoman apparatus of the 2nd embodiment which concerns on this invention for every step. It is a graph showing the change of the rotation resistance torque in each step of the ottoman device of the second embodiment according to the present invention. It is the side view which expanded and showed the locking means in the ottoman apparatus of the 2nd embodiment which concerns on this invention.

  A preferred embodiment of the ottoman device of the present invention will be described more specifically with reference to the drawings. In the following, the ottoman device of the present invention will be described by taking two embodiments of the first embodiment and the second embodiment as examples, but the technical scope of the present invention is limited to these embodiments. Without departing from the spirit of the invention, changes can be made as appropriate.

[Ottoman device of first embodiment]
FIG. 1 is a front perspective view showing the ottoman device of the first embodiment. 2 to 4 are side views showing the ottoman device of the first embodiment, FIG. 2 is when the footrest 10 is in the retracted position, and FIG. 3 is when the footrest 10 is in the use lower limit position. FIG. 4 shows the time when the footrest 10 is in the fully deployed position (use upper limit position). In FIG. 3, the malfunction preventing spring 40 is omitted. FIG. 5 is an exploded front perspective view showing the locking means 30 of the ottoman device of the first embodiment. FIG. 6 is a side view showing the locking means 30 at each stage of the ottoman device of the first embodiment. FIG. 6A shows a state where the footrest 10 is in the storage position, and FIG. When the footrest 10 is in the use lower limit position, FIG. 6C shows the case where the footrest 10 is in the use upper limit position, and FIG. 6D shows the case where the external tooth member 32 is in the retracted position. FIG. 6E shows the case where the external tooth member 32 is in the position immediately before the relock, and FIG. 6F shows the case where the external tooth member 32 is in the relock position.

  As shown in FIG. 1, the ottoman device according to the first embodiment includes a footrest 10 for placing a foot, a link mechanism 20 for supporting the footrest 10 on a seat, and a lowering of the footrest 10 under load. The locking means 30 and the malfunction prevention spring 40 for preventing the footrest 10 from rattling are provided.

[Linking mechanism]
As shown in FIGS. 2 to 4, the link mechanism 20 supports the footrest 10 in a state where the footrest 10 can be pulled out from the retracted position (FIG. 2) under the seat to the fully deployed position (FIG. 4) in front of the seat. Yes. Such support can be realized even with a four-bar linkage mechanism having four links, but in the ottoman device of the first embodiment, it is realized by a six-bar link mechanism having six links. . Specifically, as shown in FIG. 4, six links 21a, 21b, 21c, 21d, 21e, and 21f and seven links 21a to 21f that are rotatably connected to each other. The joint shafts 22a, 22b, 22c, 22d, 22e, 22f, and 22g constitute the link mechanism 20. The upper surface of the link 21 a is fixed to the lower surface of the seat front portion (not shown), and the upper surface of the link 21 d is fixed to the lower surface of the footrest 10.

  In the ottoman device of the first embodiment, the link mechanism 20 is provided in a pair of left and right as shown in FIG. 1 (see the left link mechanism 20L and the right link mechanism 20R). Each of the link mechanisms 20L and 20R has substantially the same configuration in the configurations of links 21a to 21f and joint shafts 22a to 22g described later. However, as will be described later, since the locking means 30 is fixed to the link 21a and the link 21b in the right link mechanism 20R, the specific form of the link 21a and the link 21b is the same as that of the left link mechanism 20L and the right link mechanism 20R. The link mechanism 20R is slightly different. The link 21 b in the left link mechanism 20 </ b> L and the link 21 b in the right link mechanism 20 </ b> R are connected to the left and right via a connecting member 51. Further, the link 21c in the left link mechanism 20L and the link 21c in the right link mechanism 20R are connected to the left and right via a connecting member 52 (see FIG. 4). For this reason, the link mechanism 20 has high rigidity as a whole, and can support the footrest 10 more stably.

  By the way, in the ottoman device of the first embodiment, specific two links (the ottoman of the first embodiment) connected to each other via a specific joint shaft (joint shaft 22b in the ottoman device of the first embodiment). In the apparatus, the angle φ (see FIG. 3) formed by the link 21b and the link 21c) is displaced by approximately 90 ° before the footrest 10 is pulled out from the retracted position (FIG. 2) to the fully deployed position (FIG. 4). In addition, the link mechanism 20 is set. In FIG. 2 and FIG. 4, for convenience of illustration, “angle φ” is not shown, but an angle SPT formed by the center S of the joint shaft 22a, the center P of the joint shaft 22b, and the center T of the joint shaft 22c is Corresponds to angle φ. This setting of the angle φ takes into account the attachment of the malfunction prevention spring 40. This point will be described in detail later.

[Locking means]
The lock means 30 serves not only as a lock mechanism that prevents the footrest 10 from being lowered when it receives a load, but also as an angle adjustment mechanism that enables the use angle of the footrest 10 to be adjusted. In the ottoman device of the first embodiment, as shown in FIG. 5, the locking means 30 includes an internal tooth member 31 having a large number of internal teeth 31a on a part of the inner periphery and a large number of external teeth 32a on a part of the outer periphery. An external tooth member 32 having an external tooth member, an external tooth biasing member 33 for biasing the external tooth member 32 inserted into the internal tooth member 31, and the internal tooth member 31 and the external tooth member 32. Spacer 34 and a lid member 35 that covers the inner side of the link 21b (lower right side in FIG. 5).

A joint shaft 22 a is integrated with the lid member 35. The lid member 35, the link 21 b, the external tooth member 32, the spacer 34, the internal tooth member 31, and the link 21 a are provided with the joint shaft 22 a in the shaft holes 21 b ₁ , 32 b, 34 b, 31 b, 21 a ₁ , respectively. passing bound by (the arrow C ₁ reference) it. At this time, the link 21b is in a state of being able to rotate around the joint shaft 22a with respect to the link 21a. The internal tooth member 31 is fixed so as not to rotate with respect to the link 21a. The opening size of the shaft hole 32b of the external tooth member 32 is wider than the cross-sectional size of the joint shaft 22a. In addition, the external gear member 32, external teeth rotating shaft 32c which is formed at a position away from the shaft hole 32b, the insertion state into the shaft hole 21b ₃ provided on the link 21b (see arrow C ₂₎ Is done. Therefore, the external gear member 32 relative to the link 21, and can rotate (swing) about the position _{C 2} offset from the center _{C 1} of the joint shaft 22a. One end of the external teeth biasing member 33 33a is a fixed end held by the outer teeth member holding hole 21b ₂ provided in the link 21b. On the other hand, the other end portion 33b of the external tooth biasing member 33 is a free end that is fitted into the first concave portion 32f or the second concave portion 32g provided on the outer peripheral portion of the external tooth member 32 and biases the portion into a pressed state. It is said that.

  The internal tooth member 31 and the external tooth member 32 are provided with a pair of cams 31d and 32d that constitute a retraction cam mechanism. The cams 31d and 32d constituting the retraction cam mechanism come into contact with each other when the footrest 10 is about to move upward beyond the use upper limit position (see FIG. 5), thereby causing the external teeth member 32 to move to the external teeth. 32a is retracted to a retracted position where it does not mesh with the internal teeth 31a (see FIGS. 6C and 6D). Further, the inner tooth member 31 and the outer tooth member 32 are provided with a pair of cams 31e and 32e, respectively, constituting a return cam mechanism. The cams 31e and 32e constituting the return cam mechanism come into contact with each other when the footrest 10 that rotates downward with the external tooth member 32 in the retracted position reaches the vicinity of the retracted position (see FIG. 3). The outer teeth member 32 is returned to the meshing position where the outer teeth 32a mesh with the inner teeth 31a.

  The inner teeth 31a and the outer teeth 32a have a downward rotation restricting ratchet structure. That is, in the meshed state (locked state) in which the inner teeth 31 and the outer teeth 32a mesh with each other, the link 21b cannot be rotated downward (the footrest 10 is moved downward), while the link 21b is rotated upward. Movement (upward movement of the footrest 10) is allowed. The lock mechanism described above is realized by this ratchet structure. Moreover, since both the internal tooth 31a and the external tooth 32a are provided with two or more, the position which mutually meshes can be changed. Thereby, the angle adjusting mechanism described above is realized. In the ottoman device according to the first embodiment, the footrest 10 is in four stages from the state at the use lower limit position shown in FIG. 6 (b) to the use upper limit position (full deployment position) shown in FIG. 6 (a). The use angle can be adjusted. In addition, by dispersing the force applied to the internal teeth 31a and the external teeth 32a in the locked state, the plate thickness of the internal teeth member and the external teeth member can be reduced, so that high strength is achieved while achieving weight reduction. Thus, the downward rotation of the footrest 10 can be restricted.

[Malfunction prevention spring]
The malfunction prevention spring 40 is for preventing malfunction and rattling of the footrest 10 by urging the footrest 10 downward. The malfunction prevention spring 40 may be a coil spring, a leaf spring, or the like. However, in the ottoman device of the first embodiment, a torsion spring (torsion spring) biased in a direction in which both ends thereof are closed is adopted. Yes. The place where the malfunction prevention spring 40 is provided is not particularly limited, but in the ottoman device of the first embodiment, the angle φ (see FIG. 3) is approximately 90 until the footrest 10 is pulled out from the retracted position to the fully deployed position. The link 21b and the link 21c set so as to be displaced are connected to each other. Specifically, as shown in FIG. 4, one end of the malfunction prevention spring 40 is connected to the connecting member 51 spanned between the left and right links 21 b and the connecting member spanned between the left and right links 21 c. 52 is connected to the other end of the malfunction preventing spring 40. In the ottoman device of the first embodiment, the malfunction preventing springs 40 are provided in a pair of left and right.

  At this time, a line segment PQ connecting the connecting point on the one end portion side of the malfunction preventing spring 40 (center Q of the connecting member 51) and the center P of the joint shaft 22b, and the connecting point on the one end portion side of the malfunction preventing spring 40 (connecting) The angle θ formed by the line QR connecting the center Q) of the material 51 and the connecting point on the other end side (center R of the connecting material 52) is approximately 90 ° when the footrest 10 is in the retracted position (FIG. 2). It is trying to become. For this reason, as shown in FIG. 2, when the footrest 10 is in the retracted position, the urging force of the malfunction prevention spring 40 is easily applied to the two links 21b and 21c, and the footrest 10 is difficult to jump forward from the retracted position. It is possible to do.

[Operation of locking mechanism]
Next, the operation of the lock mechanism 30 will be described. As shown in FIG. 2, when the footrest 10 is in the retracted position, the lock mechanism 30 is in the state shown in FIG. At this time, the free end 33b of the external tooth urging member 33 is fitted in the first recess 32f of the external tooth member 32, and the external tooth urging member 33 connects the external tooth member 32 to the internal tooth member. It is biased in a direction (lock position) pressed against the inner peripheral surface of 31. However, since the internal teeth 31a and the external teeth 32a do not overlap, the internal teeth 31a and the external teeth 32a are not engaged with each other.

  When the footrest 10 is rotated upward from the storage position shown in FIG. 2 to the use lower limit position shown in FIG. 3, the lock mechanism 30 is in the state shown in FIG. At this time, the lowermost (left side in the drawing) inner tooth 31a of the inner tooth member 31 and the lowermost (left side in the drawing) outer tooth 32a of the outer tooth member 32 are in mesh with each other. The external tooth urging member 33 urges the external tooth member 32 to the lock position, and the internal teeth 31a and the external teeth 32b are firmly engaged with each other. For this reason, although the footrest 10 can be moved upward, it cannot be moved downward.

  When the footrest 10 is turned upward from the use lower limit position shown in FIG. 3 to the use upper limit position (full deployment position) shown in FIG. 4, the lock mechanism 30 is in the state shown in FIG. At this time, the uppermost (right side of the drawing) internal tooth 31a of the internal tooth member 31 and the uppermost (right side of the drawing) external tooth 32a of the external tooth member 32 are engaged with each other. In the ottoman device according to the first embodiment, the meshing position of the inner teeth 31a and the outer teeth 32a is set to 4 between the use lower limit position shown in FIG. 6 (b) and the use upper limit position shown in FIG. 6 (c). It can be changed in stages, and the use height (use angle) of the footrest 10 can be adjusted in four stages. The usage height of the footrest 10 can be adjusted in more stages by increasing the number of internal teeth 31a.

  When the footrest 10 is moved further upward from the use upper limit position shown in FIG. 4, the retracting cam 31d and the retracting cam 32d shown in FIG. 6C come into contact with each other, as shown in FIG. 6D. The outer tooth member 32 is moved to a retracted position where the outer teeth 32a do not mesh with the inner teeth 31a. At this time, the place where the free end 33b of the external tooth biasing member 33 is fitted is switched from the first concave portion 32f to the second concave portion 32g, and the biasing direction of the external tooth member 32 is such that the external teeth 32a become the internal teeth 31a. Switch to a non-meshing direction. Thereby, the footrest 10 will be in the state which can be rotated downward.

  When the footrest 10 is moved downward with the external tooth member 32 in the retracted position and the footrest 10 is in the vicinity of the retracted position, the return cam 31e and the return cam 32e are moved as shown in FIG. By contacting, the external tooth member 32 is moved to the lock position as shown in FIG. At this time, the portion where the free end 33b of the external tooth urging member 33 is fitted is switched from the second concave portion 32g to the first concave portion 32f, and the urging direction of the external tooth member 32 is such that the external tooth 32a becomes the internal tooth 31a. Switch to the meshing direction. When the footrest 10 is further moved downward, the footrest 10 is again in the storage position shown in FIG. 2, and the lock mechanism 30 is again in the state shown in FIG.

  The ottoman device according to the first embodiment can perform the above-described operation only by operating the footrest 10, and does not require any additional operating means. For this reason, not only can the number of parts of the ottoman device be reduced to reduce the manufacturing cost, but also the design and manufacture of the ottoman device can be completed at the manufacturing plant.

[Ottoman device of the second embodiment]
Next, the ottoman device of the second embodiment will be described. FIG. 7 is a rear perspective view showing the ottoman device of the second embodiment. In FIG. 7, illustration of the footrest 10 is omitted. FIG. 8 is a rear perspective view showing a state in which the damper 60 in the ottoman device of the second embodiment is disassembled. FIG. 9 is a cross-sectional view showing a state in which the damper 60 in the ottoman device of the second embodiment is cut along a plane including the center line of the brake drum 61. FIG. 10 is a side view showing the periphery of the damper 60 in each stage in the ottoman device of the second embodiment. In the ottoman device of the second embodiment, configurations not particularly mentioned are substantially the same as those of the ottoman device of the first embodiment.

  As shown in FIG. 7, the ottoman device according to the second embodiment has a damper 60 attached to a link 21b. The damper 60 applies a rotational resistance torque between two specific links 21a and 21b connected to each other via a specific joint shaft 22a, so that the footrest 10 in the use position or the storage position malfunctions. This is to prevent rattling. As this damper 60, a hydraulic damper can be used, but in the ottoman device of the second embodiment, as shown in FIGS. 8 and 9, a brake drum 61, a case 62, a brake spring 63, A brake spring adjusting drum 64 is used.

The brake drum 61 is attached so as not to rotate with respect to the shaft body 21b ₄ provided integrally with the link 21b. An escape recess 61 a is provided on the outer periphery of the brake drum 61. The case 62 includes a first case 62a and a second case 62b. The first case 62a, the long hole 62a ₁ for guiding and inserting the shaft body 21a ₂ that are integrally fixed to the link 21a, the end portion by a predetermined winding number of the brake spring 63 fitted to for A winding fixing portion 62a ₂ is provided. The case 62 is attached so as to be rotatable relative to the brake drum 61 and covered with the brake drum 61. The brake spring 63 is externally fitted to the brake drum 61 in a tightened state. One end of the brake spring 63 is fixed to a groove formed in the first case 62 a, and the other end is fixed to the brake spring adjusting drum 64. The

In this damper 60, when the link 21b is rotated relative to the link 21a, the case 62 also rotates in conjunction with the link 21b. However, the case 62 includes one end portion of the brake spring 63. The other end is fixed. For this reason, the inner peripheral surface of the brake spring 63 tightens the outer peripheral surface of the brake drum 61. The resistance force accompanying this tightening becomes the resistance force (torque) at the time of rotation. This tightening force is generated at a portion where the brake spring 63 is in contact with the outer peripheral surface of the brake drum 61, and is not generated at a portion where the escape recess 61 a is provided on the outer peripheral surface of the brake drum 61. For this reason, the resistance force (torque) of rotation can be easily adjusted by changing the dimension, shape, arrangement, etc. of the recess 61a for relief. However, the turning resistance force (resisting force) changes the fixing position of the other end of the brake spring 63 with respect to the brake spring adjustment drum 64 by rotating the brake spring adjustment drum 64, so that It can also be adjusted by changing the tightening force of the drum 61. Further, the damper 60, the winding fixing part 62a ₂ which rotates independently of the brake drum 61, so were fitted to the ends of the brake spring 63 by a predetermined winding number of, between the link 21a and the link 21b When a load is applied, the winding fixing portion 62a ₂ is tightened, and a large local load is not applied to one end and the other end of the brake spring 63. For this reason, the brake spring 63 is not easily deformed.

Further, as shown in FIG. 10, the damper 60 is moved from the position where the footrest is in the retracted position (FIG. 10A) to the intermediate position (FIG. 10B) and then to the fully deployed position (FIG. 10C). between) and until, it changes the relative positional relationship between the shaft body 21a ₂ and elongated holes 62a _1, the rotational force F which tends to rotate the link 21b to the center _{C 1} around the long hole 61a ₁ abutment edge (shaft 21a ₂ abuts edge) perpendicular component of the component force f (rotational force component) is adapted to change. Specifically, when the rotational force F is the angle and ψ which makes with the abutment edges of the long holes 61a _1, the rotation component force f, since represented by F × Sinpusai, with changes in the angle ψ The rotation component force f changes. In the example of FIG. 10, the angle ψ is 28 ° when in the retracted position, the angle ψ is 90 ° when in the intermediate position, and the angle ψ is 152 ° when in the fully deployed position. The rotational component force f is 0.47F, F, and 0.47F, respectively, using the rotational force F.

  In other words, the rotational resistance torque acting between the links 21a and 21b becomes maximum when the footrest is in the retracted position and when it is in the fully deployed position, and decreases when the footrest is in the intermediate position. Yes. For this reason, it is possible to prevent malfunction and rattling of the footrest in the use position, and to prevent the footrest in the retracted position from jumping forward due to sudden braking, etc. Can be easily rotated with a small resistance. In FIG. 11, the graph showing the change of the rotational resistance torque (solid line) in each step of the ottoman device of the second embodiment is shown. The broken line in FIG. 11 is an ideal change when the hydraulic damper is used. The “rotation resistance torque ratio” on the vertical axis in FIG. 11 means a ratio when the maximum value is 100.

In the ottoman device of the second embodiment, the structure of the inner teeth 31a and the outer teeth 32b is also devised. FIG. 12 is an enlarged side view showing the locking means 30 in the ottoman device of the second embodiment. That is, as shown in FIG. 12, the arrangement center of the internal teeth 31a (the center of the arc of the intermediate surface of the internal 31a is formed. Coincides with the center C ₁₎ and a point C _1, the swing center of the external gear member 32 and a point C _2, when the center of the tooth surface on the side which receives the lower load of the pair of tooth surfaces of the inner teeth 31a and the external teeth 32a and a point C _3, the vertical the tooth surface is to the line segment C ₂ C ₃ The angle α made with respect to the normal direction is set to 13 °, and the angle β made with respect to the direction perpendicular to the line segment C ₁ C ₃ is set to 25 °. For this reason, when an abnormal load is applied to the footrest, the outer teeth 32a are caused to slip relative to the inner teeth 31a so that the ottoman device is not damaged. The upper limits of the angle α and the angle β are not particularly limited. However, in order to achieve both the angle α of 13 ° or more and the angle β of 20 ° or more, the angle α is usually 18 ° at the maximum and the angle β is 25 at the maximum. It is assumed to be °.

[Usage]
The ottoman device of the present invention described above can be provided in various seats. Especially, it can employ | adopt suitably as an ottoman apparatus of the seat with which a moving body, such as a motor vehicle, a train, a bullet train, an airplane, etc. is equipped, and can be suitably employ | adopted especially as an ottoman apparatus of the seat with which an automobile is equipped.

10 footrest 20 link mechanism 20L left side link mechanism 20R right side link mechanism 21a link (link connecting link 21f and link 21a)
21a ₁ axis hole 21a ₂ axis body 21b link (link which connects link 21a and link 21c)
21b ₁ axis hole 21b ₂ external tooth member holding hole 21b ₃ axis hole 21b ₄ axis body 21c link (link connecting link 21b and link 21d)
21d link (link connecting link 21c and link 21e)
21e link (link connecting link 21d and link 21f)
21f link (link connecting link 21e and link 21a)
22a Joint shaft (joint shaft connecting link 21a and link 21b)
22b Joint shaft (joint shaft connecting link 21b and link 21c)
22c Joint shaft (joint shaft connecting link 21c and link 21d)
22d Joint shaft (joint shaft connecting link 21d and link 21e)
22e Joint shaft (joint shaft connecting link 21e and link 21f)
22f joint shaft (joint shaft connecting link 21f and link 21c)
22g Joint shaft (joint shaft connecting link 21f and link 21a)
30 Locking means 31 Internal tooth member 31a Internal tooth 31b Shaft hole 31d Cam (retraction cam mechanism)
31e cam (return cam mechanism)
32 external tooth member 32a external tooth 32b shaft hole 32c external tooth rotation shaft 32d cam (retraction cam mechanism)
32e cam (return cam mechanism)
32g 1st recessed part 32f 2nd recessed part 33 External tooth biasing member 33a One end part (fixed end)
33b The other end (free end)
34 spacer 34b axial hole 35 lid member 40 lockout spring 51 connecting member 52 connecting member 60 damper 61 brake drum 61a relief recesses 62 case 62a first case 62a ₁ long hole 62a ₂ volumes with fixed unit 62b second case 63 brake spring 64 Brake spring adjustment drum

Claims (4)

A footrest for placing your feet,
A link mechanism for supporting the footrest on the seat in a state where the footrest can be pulled out from a retracted position below the seat to a fully deployed position in front of the seat;
Locking means to prevent the footrest from falling under load,
With
The locking means is an ottoman device that also serves as an angle adjustment mechanism that can adjust the use angle of the footrest,
Link mechanism
At least four links,
At least four joint shafts for connecting the links in a relatively rotatable manner;
Consists of
The locking means
An internal gear member having a plurality of internal teeth on a part of the inner periphery and fixed directly or indirectly to one of the two links connected to each other via one joint shaft; ,
An external tooth member having a plurality of external teeth on a part of the outer periphery and attached to the other link of the two links in a state of being swingable around a position shifted from the one joint axis; ,
An external tooth biasing member for biasing the external tooth member inserted in the internal tooth member;
Consists of
For internal tooth member and external tooth member,
The footrest consists of a pair of cams that come into contact with each other when the footrest tries to rotate upward beyond the upper limit of the use angle, and the contact causes the external teeth member to retract to a retracted position where the external teeth do not mesh with the internal teeth. A cam mechanism;
A pair of cams that come into contact with each other when the footrest that rotates downward with the external tooth member in the retracted position reaches the vicinity of the retracted position, the external tooth meshes with the internal tooth by the contact. A return cam mechanism comprising a pair of cams that return to the meshing position;
Is provided Rutotomoni,
Of the pair of tooth surfaces of the internal and external teeth, the tooth surface on the side receiving the downward load with respect to the direction perpendicular to the straight line connecting the center of the tooth surface on the side receiving the downward load and the swing center of the external tooth member The angle α made by is set to 13 ° or more,
The angle β formed by the tooth surface on the side receiving the lower load with respect to the direction perpendicular to the straight line connecting the center of the tooth surface on the lower load side and the arrangement center of the internal teeth is 20 ° or more. ,
An ottoman device in which an external tooth slips with respect to an internal tooth when an abnormal load is applied to the footrest . A footrest for placing your feet,
A link mechanism for supporting the footrest on the seat in a state where the footrest can be pulled out from a retracted position below the seat to a fully deployed position in front of the seat;
Locking means to prevent the footrest from falling under load,
With
The locking means is an ottoman device that also serves as an angle adjustment mechanism that can adjust the use angle of the footrest,
Link mechanism
At least four links,
At least four joint shafts for connecting the links in a relatively rotatable manner;
Consists of
The locking means
An internal gear member having a plurality of internal teeth on a part of the inner periphery and fixed directly or indirectly to one of the two links connected to each other via one joint shaft; ,
An external tooth member having a plurality of external teeth on a part of the outer periphery and attached to the other link of the two links in a state of being swingable around a position shifted from the one joint axis; ,
An external tooth biasing member for biasing the external tooth member inserted in the internal tooth member;
Consists of
For internal tooth member and external tooth member,
The footrest consists of a pair of cams that come into contact with each other when the footrest tries to rotate upward beyond the upper limit of the use angle, and the contact causes the external teeth member to retract to a retracted position where the external teeth do not mesh with the internal teeth. A cam mechanism;
A pair of cams that come into contact with each other when the footrest that rotates downward with the external tooth member in the retracted position reaches the vicinity of the retracted position, the external tooth meshes with the internal tooth by the contact. A return cam mechanism comprising a pair of cams that return to the meshing position;
Is provided Rutotomoni,
The rotational resistance torque acting between two specific links connected to each other via a specific joint shaft is greater when the footrest is in the fully deployed or retracted position than when the footrest is in any other position. ottoman and wherein the way things become. While the footrest is pulled from the retracted position to the fully deployed position, the angle φ formed by the specific two links connected to each other via the specific joint axis is set to be displaced by approximately 90 °,
Direction to increase the angle φ by pulling the two links and energizing the two links to a predetermined position in each of the specific two links, or enlarging the two links. By connecting the both ends of the malfunction prevention spring to prevent malfunction and rattling of the footrest,
An angle θ formed by a line segment connecting one end portion of the malfunction prevention spring and the specific joint shaft and a line segment connecting one end portion and the other end portion of the malfunction prevention spring is approximately 90 when the footrest is in the retracted position. ° and so as ottoman device according to claim 1 or 2, wherein the in. A link mechanism is provided in a pair of left and right,
The ottoman device according to any one of claims 1 to 3, wherein a specific link to which an internal tooth member in one link mechanism is fixed and a link facing the specific link in the other link mechanism are connected by a connecting material. .

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