JPH0548B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reclining device provided in a seat of a vehicle or the like.

[Conventional technology]

2. Description of the Related Art Seats in automobiles and the like are equipped with reclining devices that adjust the inclination angle of the seat back so that a seated person can assume a desired sitting posture.

Conventionally, this reclining device includes a base member fixed to a seat cushion, for example, in which a rotating arm, to which a seat bag is connected, is pivotally supported so as to be rotatable in the front-rear direction, and an engaging portion formed on the rotating arm A lock member is provided on the base portion side corresponding to the sector gear of the rotary arm, and the inclination angle of the seat back is adjusted by engaging and disengaging the lock member from the sector gear of the rotary arm using an operation handle. has been done.

However, in a reclining device configured in this way, the pitch angle of the sector gear is limited to 2 degrees due to strength reasons, and therefore the seat back can only be adjusted roughly in 2 degree increments, making it difficult for the seated person to It was difficult to adjust the inclination angle to match the body shape and preferences of people.

Therefore, in order to solve this problem, the conventional
Reclining devices have been proposed as disclosed in Japanese Patent Application Laid-Open No. 50-21861 or Japanese Patent Application Laid-open No. 50-90454.

That is, this reclining device has the configuration of the existing reclining device described above, that is, a rotating arm to which the seat back is connected is pivotally supported on a base member fixed to the seat cushion side, and a rotating arm formed on the rotating arm is supported. In addition to the structure in which a locking member is disposed on the base member side corresponding to the engaging part, and rough adjustment is made by engaging and disengaging this locking member from the engaging part of the rotating arm, The structure is configured such that fine adjustment is made by rotating the rotating arm a small amount by moving the eccentric member forward and backward by eccentric rotation while being engaged with the rotating arm, and the operation of the eccentric member and the locking member The operations are performed using separate operating members for the husband and wife.

[Problem that the invention seeks to solve]

However, this reclining device has the disadvantage that the normal rough adjustment and fine adjustment of the seat back require operating separate operating members, making the operation complicated and making it impossible to quickly adjust to the desired reclining angle. Ta.

The present invention has been made in view of these points, and provides a reclining device that allows fine adjustments to be made within a predetermined range, such as a range in which a normal sitting posture can be taken, by a normal reclining operation, This is an attempt to solve the problems of

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention pivots a base plate fixed to the seat cushion side and a rotating arm to which the seat back is connected, and also pivots a sector gear at this pivot joint, and connects the rotating arm to the rotating arm. , an eccentric cam having a crank arm is pivotally supported, the eccentric cam is engaged with a sector gear, and a locking mechanism that engages with the sector gear is disposed on the base plate, and a locking mechanism that engages with the sector gear is disposed on the base plate. A slit serving as an engaging portion is formed to a required length, and an engaging pin protruding from the end of the crank arm is engaged with the slit.

[Effect]

The measures described above operate as follows.

When the seat back is in the neutral position, the engagement pin of the crank arm is engaged with the top of the slit, and when the rotating arm is rotated forward or backward from this state, the crank arm will move accordingly. While the engaging pin is moved downward within the slit, it is rotated using the engagement portion between the engaging pin and the slit as a fulcrum, so that the eccentric cam is rotated eccentrically with respect to the rotating arm together with the crank arm. As a result, the engagement part between the eccentric cam and the sector gear is displaced, and the sector gear is pushed and rotated so as to be displaced from the rotation arm. It will be rotated a lot. In this way, in a predetermined range centered on the neutral position, that is, in a range where the engagement pin of the crank arm is engaged with the slit and moved along this slit, the sector gear is rotated more than the rotation arm. As a result, the rotation angle of the rotation arm per pitch of the sector gear becomes relatively small, and by locking the sector gear with the lock mechanism within this range, minute rotation angles smaller than the pitch angle of the sector gear can be prevented. Adjustments are made.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 indicates the entire reclining device of the present invention, and this reclining device 1 is arranged in a range where a seated person can take a normal driving posture, that is, for example, 15 degrees forward and backward around a neutral position.
Fine adjustment is possible over a range of degrees.

Reference numeral 2 designates a base plate of this reclining device 1, and this base plate 2 is fixed to the side rear end of the seat cushion through attachment holes 3a and 3b formed at the front and rear thereof. A shaft 4 is erected in the center of the base plate 2, and a rotating arm 5 is pivotally supported on this shaft 4 so as to be rotatable in the front and back direction. A seat bag is connected through the provided attachment hole 5a.

Further, a spiral spring 6 is wound around the shaft 4 on the outside of the rotating arm 5, and the inner end 6a of the spiral spring 6 is attached to the shaft 4.
The outer end 6b is respectively locked to a locking part 4a formed in the shape of a notch at the tip of the rotating arm 5, and is rotated by the biasing force of the spiral spring 6. The movable arm 5 is always urged forward to rotate.

Also, inside this rotating arm 5, a sector gear 7 is coaxially connected to the rotating arm 5.
The sector gear 7 is rotatably supported by a shaft separately from the sector gear 7, and a pair of arc-shaped long holes 8a and 8b are bored in the lower part of the sector gear 7, with the sector gear 7 as the center. , rivets 9a and 9b implanted in the rotating arm 5 are inserted and engaged, and both are rotatably connected within the range of the elongated holes 8a and 8b, that is, within a required range to be described later.

A cam shaft 11a of an eccentric cam 11 as an eccentric member is rotatably supported in a shaft hole 10 formed in the rotary arm 5 above its shaft support. It is movably engaged with a long hole 12 formed in the.

Also, this eccentric cam 11 has a crank arm 13.
is fixed to the crank arm 13, and an engagement pin 14 is protruded from the free end of the crank arm 13.
The slit 15 is inserted into and engaged with a slit 15 formed with a required length in a direction perpendicular to the direction of rotation. An arcuate slit 15a is formed continuously at the lower end of this slit 15, and is centered around the pivot of the rotating arm 5. Further, a locking pin 16 is located above the slit 15 and protrudes from the base plate 2, and a coil spring 17 is provided between the locking pin 16 and the engagement pin 14 of the crank arm 13.
is stretched, and the engagement pin 14 of the crank arm 13 is always urged upward by the biasing force of the coil spring 17.

Furthermore, a lock mechanism 18 is provided at the bottom of the base plate 2 in correspondence with the sector gear 7. That is, a lock gear 20 is rotatably supported by a shaft pin 19 erected at the lower rear end of the base plate 2 in a vertical direction, that is, in a direction in which it is engaged with and disengaged from the sector gear 7. The end portion extends forward and forms an engaging portion 20a. Further, in front of the lock gear 20, an L-shaped operating lever 21 is rotatably supported at its bent portion by a shaft pin 22 protruding from the base plate 2, and one end of this operating lever 21 A handle 23 is attached to one end, and a pin 24 is provided upright at the other end.
is abuttingly engaged with the lower edge of the engaging portion 20a of the lock gear 20 via the roller 25.

Furthermore, a coil spring 27 is provided between one side of the operating lever 21 and a locking pin 26 located below this and protruding from the base bracket 2.
is stretched, and the biasing force of this coil spring 27 causes the operation lever 21 to move to the lock gear 20.
As a result, the lock gear 20 constantly engages with the sector gear 7 to lock the rotating arm 5, and the handle 2 of the operating lever 21
By rotating the lock gear 3 upward against the biasing force of the coil spring 27, the pressure on the lock gear 20 by the pin 24 is released, and the lock gear 20 rotates downward under its own weight, detaching from the sector gear 7, and locking. It is done so that it is released.

Next, the operation of the reclining device 1 of this example configured as described above will be explained.

The seat back or rotating arm 5 is now locked in the neutral position, and in this state the engagement pin 14 of the crank arm 13 is engaged at the uppermost end of the slit 15 (see FIG. 1).

From this state, when the lock is released by operating the operating lever 21 and the rotating arm 5 is rotated rearward by pressing the seat bag with the back, the crank arm 13 is rotated as the rotating arm 5 is rotated. The engaging pin 14 moves downward along the slit 15 and rotates around the engaging portion between the engaging pin 14 and the slit 15, thereby causing the eccentric cam 11 to connect with the crank arm 13. The state is such that the eccentric cam 11 and the sector gear 7 are rotated eccentrically with respect to the rotating arm 5, and the engagement portion between the eccentric cam 11 and the elongated hole 12 of the sector gear 7 is displaced, and the eccentric cam 11 is rotated eccentrically with respect to the edge of the elongated hole 12 of the sector gear 7. , the sector gear 7 is rotated so as to be displaced from the rotation arm 5 (see FIG. 4).

That is, the rotation angle α of the rotation arm 5 and the sector gear 7
The sum of the deviation angles is the rotation angle θ of the sector gear 7,
Therefore, the sector gear 7 is rotated by a larger amount than the amount of rotation of the rotation arm 5, and the rotation angle of the rotation arm 5 per pitch of the sector gear 7 becomes relatively small. Therefore, by operating the operating lever 21 in this state to engage the lock gear 20 with the sector gear 7, the rotating arm 5, that is, the seat back, can be adjusted at a fine angle less than the pitch angle of the sector gear 7.

Further, when the seat back is further pressed and the rotating arm 5 is rotated rearward, the crank arm 13
The engagement pin 14 moves from the lower part of the slit 15 to the arcuate slit 15a, and
5a (see FIG. 5). In the range in which the engagement pin 14 is moved along the arc-shaped slit 15a, the engagement pin 14 is Since the engagement with the base plate 2 is released, the crank arm 13 is not rotated relative to the rotating arm 5, and the sector gear 7 is rotated while being held stationary relative to the rotating arm 5. will be moved. Therefore, in this state, by operating the operating lever 21 to engage the lock gear 20 with the sector gear 7, the rotating arm 5 is rotated.
is roughly adjusted at intervals corresponding to the pitch angle of sector gear 7, and furthermore, rotation arm 5
By rotating the seat back, the seat back can be set to a fully reclined state.

Furthermore, when the seat back is raised from this state and returned to the neutral position, the engagement pin 14 of the crank arm 13 smoothly slides from the arcuate slit 15a into the slit 15 because it is urged upward by the coil spring 17. and return to its original position.

Further, when the seat back is tilted forward from the neutral position in the opposite manner to the above, the sector gear 7 is rotated more than the rotation arm 5 due to an operation symmetrical to the above, and in this state, the sector gear 7 is locked by the lock mechanism 18. By doing this, fine adjustment of the seat back in the forward tilted state is performed.

Then, when the seat back is further tilted forward, the engagement pin 14 of the crank arm 13 is inserted into the slit 15.
By moving from the seat back to the arcuate slit 15a and moving along the front half thereof, the seat back is set in a forward-folding state.

As described above, in the reclining device according to the present invention, the engaging pin 14 of the crank arm 13 engages with the slit 15 within the range in which the rotating arm 5 is rotated by a predetermined angle, that is, as the rotating arm 5 rotates. In the range where the crank arm 13 is assembled and moved, the crank arm 13
When the sector gear 7 is rotated and the eccentric cam 11 is rotated, the sector gear 7 is largely rotated with respect to the rotation arm 5. Adjustments will be made.

Therefore, the range in which the rotating arm 5 is finely adjusted is
Engagement pin 1 between slit 15 and crank arm 13
By being determined by the engagement range with 4,
In this example, this slit 15 and the engagement pin 1
4, that is, the length of the slit 15 and the crank arm 13, the rotation arm 5 can be moved back and forth around the neutral position as in the above-mentioned embodiment.
When making fine adjustments within the range of rotation of about 15 degrees, use the slit 15 and crank arm 1 accordingly.
Set the length of 3.

Furthermore, in the configuration of this example, by increasing the amount of eccentricity of the eccentric cam 11, the amount of rotation of the sector gear 7 with respect to the rotation arm 5 becomes large, so that the rotation arm 5 can be rotated at a finer pitch. On the other hand, if the fine adjustment pitch of the rotary arm 5 is not changed, the pitch angle of the sector gear 7 can be made large, which has the effect of ensuring sufficient strength of the sector gear 7.

Further, in this example, an example is shown in which a cam is used as the eccentric member, but the present invention is not limited to this. For example, a crank-shaped shaft may be provided in place of the cam, and the bent portion of this shaft may be formed in the sector gear 7. It can also be configured to be movably engaged with the elongated hole, and in this case as well, fine adjustment is performed by the same operation as when using the above-mentioned cam.

Further, in this example, a slit 15 is formed as an engaging portion, but a concave groove may be provided in place of this slit 15, and the arc-shaped slit 15a is
The present invention is not limited to this, but any configuration may be used as long as the engagement of the engagement pin 14 with the base plate 2 is released.

〔Effect of the invention〕

As described above, the reclining device of the present invention has
By rotating the sector gear more than the rotation arm within a predetermined range, that is, the range where a normal sitting posture can be taken, fine adjustment of the pitch angle of the sector gear or less can be made, and this fine adjustment is made separately as in the past. Since the reclining operation is performed by a normal reclining operation without using any operating member, the seated person can quickly and accurately adjust the reclining angle to a desired angle.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of the reclining device of the present invention, FIG. 2 is a sectional view taken along the line -' in FIG. 1, FIG. 3 is an exploded perspective view of the reclining device of the present invention, and FIGS. FIG. 5 is an explanatory diagram of the same operation. In the figure, 2 is a base plate, 5 is a rotating arm,
7 is a sector gear, 11 is an eccentric cam, 13 is a crank arm, 15 is a slit, and 18 is a lock mechanism.

Claims (1)

[Claims] 1 A base plate fixed to the seat cushion side and a rotary arm to which the seat back is connected are pivotally connected, a sector gear is pivotally connected at the pivot joint, and an eccentric member having a crank is pivotally supported on the rotary arm. The eccentric portion of the eccentric member is engaged with the sector gear, and the base plate is provided with a lock mechanism that engages with the sector gear, and the locking mechanism is engaged for a required length in a direction crossing the rotational direction of the rotation arm. and an end of the crank is engaged with the engaging portion, so that when the rotating arm rotates, the sector gear is rotated more than the rotating arm within a predetermined range. A reclining device characterized by: