JPS6025122B2 - seat tilt device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat reclining system, which is characterized by a simple structure, easy operation, smooth release of the restraint of the backrest, and firm retention of the restraint. It is something.

Examples of the present invention will be described below.

In the figure, the seat tilting device includes a base plate 1 fixed to the side surface of the seat, and an arm 2 fixed to the side surface of the backrest, and the arm 2 is rotatably connected to the base plate 1 by a pivot 3.

The pivot 3 is composed of a pair of arcuate portions 4, each of which has a
has an arcuate outer peripheral surface 5 formed around a common center with a radius of the same length, and a mutually parallel guide surface 6, and the arcuate portion 4
The center of coincides with the center of axis 3. The arm 2 has a shaft hole 8 formed in its lower part, and the groove hole 8 is engaged with the pivot 3 so that the arm 2 can rotate around the pivot 3.

Internal teeth 9 are formed all around the inner peripheral surface of the shaft hole 8, and these internal teeth 9 slide on the outer peripheral surface 5 of the pivot shaft 3. The internal teeth 9 are formed so as not to be damaged or worn out due to the above-mentioned super-motion, but the internal teeth 9 are formed into a separate arc-shaped member (not shown), and the inner teeth 9 are formed into a separate arc-shaped member (not shown), and the inner teeth 9 are formed by screwing the inner teeth into the arm 2. Alternatively, they may be connected by a fixing means such as welding, and the inner circumferential surface of the hole 8 may be smoothed to cover the ball. The latter case is preferable because it prevents damage and wear on the internal teeth 9 and allows the arm to rotate smoothly, but the former case is preferable because the arc member can be omitted, the structure is simple, and the axial depth is small. Dimensions can be shortened. Restraint member 1
0' has external teeth that mesh with the internal teeth 9 of the arm 2 at one end of the mandrel, and the guide surface 6' is provided in a space surrounded by the guide surface 6 of the Shoto 3 so as to sandwich the center of the pivot 3. It is moved left and right on the drawing along this line.

When these restraining members 10 move away from each other, the external tooth turtle 1 meshes with the internal teeth 9 and restricts the rotation of the arm 2, and when they move toward each other, the external tooth turtle 1 engages with the internal teeth 9 and restricts the rotation of the arm 2.
is disengaged from the internal teeth 9, and the arm 2 becomes rotatable. The restraining portion 30' is fixed to an arcuate plate 121 by a pin 13, and surfaces 14 of the plate 13 corresponding to the chords are parallel to each other and arranged symmetrically with respect to the center of rotation.

The rotating cam 7 has a central axis 15 that is co-located with the pivot 3.
The cam surface 6 on the outer periphery contacts the surface 14 of the plate ridge 2, and the rotation of the cam 7 draws the plates 12 apart from each other. The lever 2 is connected to the central axis 15, and the rotary cam 7 is fixed thereto, and a pin 17 is fixed to the lever symmetrically with respect to the center as means for releasing the engagement between the inner and outer teeth 9 and the ridge 1. The pin 17 is iron-coupled to a cam groove 8 formed in the plate 12, and the rotation of the pin 7 draws the plates 12 together.The lever 28' is moved to the lowered position by the spring 19 in FIG. The external teeth 11 of the restraint member 10 mesh with the internal teeth 9 of the arm 2, and the arm 2
is restrained.

When the lever 20 is pulled up, the cam 7 and pin 17 rotate clockwise, and the pin 17 presses the cam groove 18 to draw the restraining members 10 together, disengaging the external teeth 11 and internal teeth 9, and releasing the arm 2. becomes rotatable. After adjusting the arm 2 to the desired angle, release the pulling force on the lever 20, the lever 2 is pulled down to its original position by the spring 19, and the cam 7 rotates counterclockwise to lock it. Bemura] draw 0 to each other, arm 2
to restrain. Although the internal teeth 9 are formed all around the gutter hole 8, they may be formed partially depending on the range of the adjustment angle. In the present invention, the hole 8 of the arm 2 is iron-coupled with the pivot shaft 3 of the pair of arcuate parts 4 formed on the base plate 1', and the restraining member 10 is placed in the space formed by the guide surface 6 of the arcuate part 4. The cam periphery 16 of the rotary cam at the center of the cam 7 is engaged with the surface 14 of the plate 12 integral with each restraint member IQ. 10 is drawn linearly along the guide surface 6 of each arcuate portion 4 of the pivot 3, and the external teeth il of the restraining member 10 are engaged with the internal teeth 9 of the arm 2, thereby restraining the arm 2. Therefore, the meshing of both the inner and outer teeth 9, 11 is done smoothly without interfering with each other, and is strongly held.
Moreover, when a rotational force is applied to the arm 2, the pair of restraining members 1
0 is pressed against and received by each guide surface 6 of the pair of arcuate portions 4 of the pivot, and acts to press both sides of the rotating cam 7 via a plate 12 that is integrated with each restraining portion village, Therefore, the central shaft 15 around which the cam 7 rotates and the restraint member 10' are not subjected to excessive force and are highly durable. Since the device also serves as a means, the structure can be simplified and the entire structure can be made compact.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. is a partially omitted front view. Figure 7 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A base plate 1 fixed to the side surface of the seat, and an arm 2 pivotally connected to the base plate by a pivot 3 and fixed to the side surface of the backrest, the pivot 3 integrally protruding from the base plate 1 and crossing the center thereof. It is composed of a pair of arcuate portions 4 having mutually parallel guide surfaces 6 and an arcuate outer circumferential surface 5, and is fixed to the substrate 1.
has a shaft hole 8 in its lower part, the shaft hole 8 rotatably fits into the pivot 3, and internal teeth 9 are provided in the arm 2 to restrain rotation of the arm 2 relative to the base plate 1. A pair of restraint members 10 having external teeth 11 are formed around the rotation center of the pivot shaft 3 in the space formed by the guide surface 6 of the pivot shaft 3 on a straight line that crosses the rotation center in a direction in which they approach each other with the rotation center sandwiched between them. It is incorporated so that it can reciprocate in the direction away from each other, and when the restraining member 10 moves in the direction away from each other, both teeth 9 and 11 mesh with each other.
The teeth 9 and 11 are disengaged by movement toward each other, and can be rotated around a plate 12 having surfaces 14 facing each other and fixed to each restraining member 10 and a central shaft 15 fixed to the base plate 1. A rotary cam 7 that is loosely fitted into the central shaft 15 and has a peripheral edge 16 that engages with the surface 14 of the plate 12 and moves the restraining member 10 in the meshing direction; , a cam groove 18 formed in each plate 12, and a pin 17 that fits into the cam groove and is fixed to the lever 20 to move the restraining member 10 in the releasing direction. Seat tilt device.