Reclining apparatus and automotive seat provided with the same

The invention provides a reclining apparatus which can make a width of an apparatus small. The reclining apparatus of the present invention is provided with a first bracket (1) attached to a seat back (10), a second bracket (2) attached to a seat cushion (11), a first shaft (3) forming a rotation center of the first bracket (1), a spiral spring (5) spirally wound around the first shaft (3) and biasing a rotation in a forward direction of the first bracket (1), and a rotary damper (6) decelerating a rotating speed of the first bracket (1) against an biasing force of the spiral spring (5). The rotary damper (6) and the spiral spring (5) are arranged in parallel, and an arm (7) rotating a casing (6a) of the rotary damper (6) on the basis of a rotation of the first bracket (1) is provided between the rotary damper (6) and the second bracket (2).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a reclining apparatus and an automotive seat provided with the same.

2. Background of the Invention

For example, in Japanese Utility Model Laid-Open Disclosure No. 6-58740, there is disclosed a reclining apparatus provided with a first bracket attached to a seat back, a second bracket attached to a seat cushion, a first shaft forming a rotation center of the first bracket, a spiral spring spirally wound around the first shaft and biasing a rotation in a forward direction of the first bracket, and a rotary damper decelerating a rotating speed of the first bracket against an biasing force of the spiral spring.

However, in the reclining apparatus mentioned above, the structure is made such that the first shaft forming the rotation center of the first bracket is concentric with the second shaft forming the rotation center of a casing of the rotary damper, and the rotary damper is arranged in a further outer side of the spiral spring arranged in an outer side of the second bracket. In other words, since the structure is made such that the rotary damper and the spiral spring are arranged in series, there is a problem that a width of the apparatus cannot help being enlarged. For example, in a motor vehicle, it is general that an installation space of the reclining apparatus cannot be sufficiently secured between a seat and a vehicle body, and it is hard to install the reclining apparatus having a large width. On the other hand, in order to make the width of the reclining apparatus small, there can be considered that a thickness of the rotary damper is made thin. However, in this case, there is generated a problem that a braking characteristic of the rotary damper is lowered.

DESCRIPTION OF THE INVENTION

Problems to be Solved by the Invention

The present invention is made by taking the circumstances mentioned above into consideration, and an object of the present invention is to provide a reclining apparatus which can make a width of an apparatus small, and an automotive seat provided with the same.

Means for Solving the Problem

In order to solve the problem mentioned above, the present invention provides the following reclining apparatus and the following automotive seat.

1. A reclining apparatus comprising a first bracket attached to a seat back, a second bracket attached to a seat cushion, a first shaft forming a rotation center of the first bracket, a spiral spring spirally wound around the first shaft and biasing a rotation in a forward direction of the first bracket, and a rotary damper decelerating a rotating speed of the first bracket against an biasing force of the spiral spring, wherein the rotary damper and the spiral spring are arranged in parallel, and an arm rotating a casing of the rotary damper on the basis of a rotation of the first bracket is provided between the rotary damper and the second bracket.

2. An automotive seat comprising the reclining apparatus as recited in the item 1 mentioned above.

Effect of the Invention

In accordance with the invention described in the item 1 mentioned above, since the rotary damper and the spiral spring are arranged in parallel, it is possible to make the width of the apparatus smaller as compared with the conventional reclining apparatus. Further, since a limit to a thickness of the rotary damper is reduced by the parallel arrangement of the rotary damper and the spiral spring, it is possible to employ the rotary damper having a high braking characteristics.

Further, according to the present invention, since the arm rotating the casing of the rotary damper on the basis of the rotation of the first bracket is provided between the rotary damper and the second bracket, the first bracket is rotated in the forward direction, whereby the casing of the rotary damper is rotated. Accordingly, the rotary damper generates the braking force against the biasing force of the spiral spring, thereby decelerating the rotating speed of the first bracket on the basis of the braking force.

In accordance with the present invention described in the item 2 mentioned above, even in the case where the installation space of the reclining apparatus formed with respect to the vehicle body is narrow, it is possible to install the automotive seat provided with a reclining function achieved by a combination of the spiral spring and the rotary damper.

DESCRIPTION OF REFERENCE NUMERALS

BEST MODE OF CARRYING OUT THE INVENTION

A description will be given below of a mode for carrying out the present invention on the basis of an embodiment shown in the drawings. In this case, in the following description, a subject to which a reclining apparatus in accordance with the present invention is applied is set to an automotive seat, however, the reclining apparatus in accordance with the present invention can be applied to the other seats (for example, a seat for the other vehicles than a motor vehicle, a seat for an aircraft, a seat for a ship and the like) than the automotive seat.

EMBODIMENT

FIGS. 1 and 2are schematic views showing a main portion of a reclining apparatus in accordance with an embodiment of the present invention. As shown in these drawings, the reclining apparatus in accordance with the present embodiment is structured such as to have a first bracket1, a second bracket2, a first shaft3, a spiral spring5, a rotary damper6and an arm7.

The first bracket1is attached to a side surface of a seat back10. The second bracket2is attached to a side surface of a seat cushion11. The first bracket1and the second bracket2are coupled by the first shaft3, and the first bracket1is rotatable around the first shaft3.

The spiral spring5is spirally wound around the first shaft3. One end of the spiral spring5is connected to a second locking portion9provided in the second bracket2, and the other end of the spiral spring5is connected to a first locking portion8provided in the first bracket1. The spiral spring5arranged as mentioned above is wound up so as to store an biasing force on the basis of a movement of the first locking portion8in accordance with a rotation in a backward direction of the first bracket1.

The rotary damper6is supported to a second shaft4provided in the first bracket1. The second shaft4has a different axis from the first shaft3, and is provided at a position with a predetermined distance away from the first shaft3. Further, the second shaft4forms a rotation center of a casing6aof the rotary damper6.

As the rotary damper6, it is possible to employ, for example, a structure in which a viscous body such as a grease or the like is filled between facing surfaces of a movable member and a fixed member provided within the casing6a, and a viscous resistance of the viscous body is generated on the basis of a mutual displacement between the facing surfaces generated by the rotation of the casing6a. Further, in addition to these, the rotary damper6can employ a structure in which a viscous liquid such as a silicone oil or the like is filled within the casing6a, and the viscous liquid is pressed by a pressing member on the basis of the rotation of the casing6a, thereby generating a resistance of the viscous liquid.

The casing6aof the rotary damper6is structured such as to have an approximately circular main body portion6b, and a collar portion6cprotruding from the main body portion6b.

The rotary damper6and the spiral spring5are arranged in parallel as shown inFIGS. 1 and 2. As mentioned above, since the rotary damper6is supported to the second shaft4provided in the first bracket1, the first bracket1is rotated, whereby the rotary damper6itself is moved around the spiral spring5.

The arm7is provided between the rotary damper6and the second bracket2. The arm7is structured such that one end is connected to the second bracket2, and the other end is connected to the collar portion6cconstructing the casing6aof the rotary damper6. The arm7provided as mentioned above is structured such as to oscillate by setting the connection portion to the second bracket2as a supporting point, in correspondence to a motion of the rotary damper6moving around the spiral spring5. Further, since the arm7exists between the rotary damper6and the second bracket2, the arm7is oscillated in correspondence to the rotation of the first bracket1, and the casing6aof the rotary damper6is rotated around the second shaft4(refer toFIG. 1).

In the case where the reclining apparatus structured as mentioned above is applied to the seat arranged in the motor vehicle, the seat back10can be rotated by operating an operation lever (not shown) of the reclining apparatus so as to release an engagement between a gear (not shown) and a ratchet (not shown). If the engagement between the gear and the ratchet is released in a state in which the seat back10is reclined backward, the first bracket1is rotated in a forward direction on the basis of the biasing force of the spiral spring5, and the seat back10is rotated in the same direction in accordance therewith. At this time, the arm7is oscillated by setting the connection portion to the second bracket2as a supporting point in correspondence to the motion of the rotary damper6moving around the spiral spring5, and the casing6aof the rotary damper6is rotated around the second shaft4. Accordingly, the rotary damper6generates a braking force against the biasing force of the spiral spring5, and it is possible to decelerate the rotating speed of the first bracket1and the seat back10to which the first bracket1is attached.

As described above, in accordance with the reclining apparatus on the basis of the present embodiment, since the rotary damper6and the spiral spring5are arranged in parallel, it is possible to make the width of the apparatus smaller than the conventional reclining apparatus. Accordingly, in the case where the reclining apparatus mentioned above is applied to the automotive seat, even if the installation space of the reclining apparatus formed with respect to the vehicle body is narrow, it is possible to install the automotive seat provided with the reclining function achieved by combining the spiral spring5and the rotary damper6.

Further, whichever the rotary damper utilizes the viscous resistance of the viscous body mentioned above, or utilizes the resistance of the viscous liquid mentioned above, the rotary damper can generally increase the facing area between the movable member and the fixed member and increase an amount of the viscous liquid in accordance with an enlargement of the thickness of the casing. Accordingly, it is possible to increase a braking characteristic of the rotary damper. In this regard, in accordance with the reclining apparatus on the basis of the present embodiment, since the rotary damper6and the spiral spring5are arranged in parallel, whereby the limitation to the thickness of the rotary damper is alleviated, it is possible to employ the rotary damper having the high braking characteristic.