JPH0454023Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a front-rear tilt mechanism that is provided on the side of a seat frame loaded with seats and tilts the seat cushion back and forth together with the seat frame.

[Prior art]

The front and rear tilt mechanism includes a pair of link mechanisms arranged front and rear on each side of the seat frame. The two front and rear link mechanisms are configured such that the front or rear link mechanisms are interlocked with each other to independently lift the front or rear of the seat frame.

Therefore, by raising and lowering the links of the front and rear link mechanisms to create a difference in their rising heights, the seat frame can be tilted back and forth. The cushion seat on the seat frame is then appropriately tilted to obtain a desired seating posture.

[Problems with conventional technology]

By the way, in the known longitudinal tilt mechanism, movement of the links of each link mechanism occurs by rotating each handle. That is, when the front handle is rotated, the front lock plate is unlocked, and the two front links on both sides move up and down in conjunction with each other. When the rear handle is rotated, the rear lock plate is unlocked and the two rear links on both sides move up and down in conjunction with each other.

In such a configuration, the front lock plate or rear lock plate cannot be unlocked unless the front and rear handles are operated individually, which prevents the seat frame from tilting, making it impossible to quickly set the desired seating position, and making operation difficult. inferior to sex. Further, since two handles are provided, the structure tends to be complicated, giving an impression of being complicated and unfavorable in terms of appearance.

[Purpose of invention]

The purpose of this invention is to provide a seat tilt mechanism with excellent operability.

[Summary of the idea]

To achieve this purpose, according to this invention,
The front and rear link mechanisms and lock plates are each placed on either side of a single handle provided in the center of one side of the seat frame.

The handle shaft (handle shaft) is
The release piece is provided in the center of the seat frame so as to be rotatable and movable up and down, and the release piece is provided on the handle shaft and extends in the front-rear direction of the seat frame. The front and rear lock plates are
One end of the lock plate, which has a plurality of teeth on its lower surface and is remote from the handle shaft, is rotatably attached to the front and rear of the seat frame by a pivot pin.

An actuation piece is provided at the other end of the lock plate, that is, at the end of the lock plate adjacent to the handle shaft. This actuating piece is formed, for example, by bending the lock plate, so that when the handle shaft is rotated or moved up or down, it is pressed against the release piece, moves together with the release piece, and rotates the lock plate. has been done.

Furthermore, the front and rear link mechanisms are constructed with a link provided at one end with a locking pin that engages with the teeth of the corresponding locking plate, and the link is provided with a connecting link so as to be able to vary its rising height. connected.

The locking pin of each linkage link is biased by biasing means, such as a tension spring, into the teeth of the corresponding locking plate.

The actuation piece of each locking plate is also biased towards the release side by further biasing means, such as a tension spring.

[Effect]

In such a configuration, when the handle shaft, that is, the handle is rotated, the release piece that extends in the front and back direction is pressed against one of the actuating pieces, and resists the biasing force of the biasing means to integrally move the actuating piece. to rotate the lock plate around the rotation pin. Then, when the lock plate rotates,
The lock plate is separated from the lock pin, releasing the locked state of the lock plate and freeing the lock plate. Therefore, the seat frame and thus the seat cushion thereon are tilted back and forth. It goes without saying that if the handle is rotated in a different direction, a similar movement will occur in the other lock plate.

Also, if the handle is not rotated and the handle is pulled up, for example, the release piece presses both actuating pieces simultaneously. Therefore, the front and rear lock plates are rotated at the same time, and the seat frame is raised and lowered without tilting.
A so-called parallel shift is performed.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the longitudinal tilt mechanism 10 according to this invention consists of a handle 14 provided at the center of the side of the seat frame 12, and a handle 14 disposed in the longitudinal direction of the seat frame with the handle in between. A pair of lock plates 16, 17, link mechanism 2
0, 21.

As can be clearly seen from FIG. 2 in addition to FIG. 1, the handle 14 includes a shaft (handle shaft) 26, and a disc-shaped knob (handle knob).
24 is attached to one end (front end) of the handle shaft.

The spline 25a is the boss 24a of the handle knob.
and a corresponding spline 25
b is formed at one end of the handle shaft 26, and the splines 25a and 25b are fitted to integrate the handle knob 24 and the handle shaft.

Further, a substantially U-shaped clip 27 is attached to the locking groove 24b of the handle knob and the locking groove 2 of the handle shaft.
The handle shaft 26 is inserted and locked into the handle shaft 6a.
This prevents the handle knob 14 from falling off. The other end (rear end) of the handle shaft 26 is formed to have a large diameter, and the connecting shaft 28 is inserted into the large diameter portion of the handle shaft.

The connecting shaft 28 has a long hole 29 passing through it,
A connecting pin 30 is inserted through the elongated hole and a hole 31 in the large diameter portion of the handle shaft 26 to connect the connecting shaft and the handle shaft. Through hole 28a
is bored in the connecting shaft 28. The connecting shaft 28 extends between a pair of brackets 32 and 33 attached to the seat frame 12 by welding or the like, and a swing pin 34 having a head 34a is inserted into the mounting holes 32a and 33a of the brackets. As a result, the connecting shaft is swingably attached to the seat frame 12. Note that the E-ring 35 fits into the locking groove 34 at the tip of the swing pin.
b is fitted and locked to prevent the swing pin from falling off. Additionally, a release piece 36 in the form of a pin is also provided.
passes through a hole in the handle shaft 26 and extends horizontally in the front-rear direction.

In the above configuration, as can be clearly seen from Figure 3,
The handle shaft 26 can be pivoted around the connecting shaft 28 until the connecting pin 30 abuts against the upper or lower wall of the elongated hole 29. In other words, the handle shaft 26, that is, the handle 14 can be rotated within the range of angle α in the left and right directions. Further, the handle 14 can swing vertically about the swing pin 34, thereby allowing it to be pulled up or pushed down.

Here, the lower wall of the long hole 12a of the seat frame comes into contact with the handle shaft 26, restricts the downward movement of the handle shaft, and prevents the handle 14 from moving downward.
It is preferable to set it so that it is held horizontally.

Note that the handle 14 only needs to be movable in the vertical direction, and may be configured so that it can be pushed down instead of being pulled up as in the embodiment. Moreover, although the release piece 36 is embodied as a pin, as will be described later, it is sufficient to press the operating piece and move it integrally, and the form of the release piece is not limited to the pin.

As shown in Fig. 1, a pair of lock plates 1
6 and 17 are arranged symmetrically across the handle 14, and a plurality of teeth 38 and 39 are formed on the lower surface of each lock plate. One end of each lock plate away from the handle 14, that is, the left end of the front lock plate 16 and the right end of the rear lock plate 17, is rotated to the side of the seat frame 12 by rotation pins 40 and 41, respectively. installed as possible.

Actuating pieces 44 and 45 are provided at the other ends of each lock plate, that is, at the ends adjacent to the handle shaft 26, the right end of the front lock plate 16 and the left end of the rear lock plate 17. These operating pieces 44, 45 are pressed against the release piece 36 when the handle 14 is pulled up and rotated, and are formed in a shape that allows them to move upward in response to the movement of the release piece. .

In the embodiment, the ends of the lock plates 16, 17 are bent at right angles to form operating pieces 44, 45 integrally with the lock plates. seat frame 12
is integrally provided with a support piece 48 made of a bent piece below the handle shaft 26, and the tension springs 50, 5
Biasing means such as 1 actuate the supporting piece and the actuating piece 4.
4 and 45, respectively. The tension springs 50, 51 bias the lock plates 16, 17 around the pins 40, 41 in a clockwise direction (for the front lock plate 16) or counterclockwise (for the rear lock plate 17), causing the actuating piece 44 , 45 are brought into contact with the release piece 36. In this way, by the actuating pieces 44 and 45 coming into contact with the release piece 36 on both sides,
The release piece is set horizontally.

In such a configuration, when the handle knob 24 is gripped and rotated together with the handle shaft 26 clockwise or counterclockwise, the actuating pieces 44 and 45 move as the release piece 36 rotates. It is pressed and moves upward.

Further, the pair of link mechanisms 20, 21 includes links 54, 55, and these links have lock pins 56, 57 at their upper ends that can be engaged with the teeth 38, 39 of the corresponding lock plate. Its lower end is pivoted to leg 60 by pins 58 and 59. Further, the links 54 and 55 are connected to the connecting link 6 so as to change their rising heights.
2,63. In other words, the upper ends of the connecting links 62 and 63 are connected to the rotation pins 40 and 41.
It is pivotally supported on the seat frame 12 by using the .

The biasing means, for example tension springs 72, 73,
They are stretched between the pins 40, 41 and the lock pins 56, 57, respectively, to bias the lock pins 56, 57 in the direction of the pins 40, 41.

In the embodiment, the handle 14, the lock plate 1
6, 17, link mechanisms 20, 21, etc. are arranged on the left side of the seat frame 12. Further, another link mechanism 76, 77 is arranged on the right side of the seat frame 12, and the link mechanism 76, 77 is disposed on the right side of the seat frame 12.
77 is operatively connected to the link mechanisms 20 and 21 via connection shafts 78 and 79.
Links 80 and 81 of link mechanisms 76 and 77 are provided with pins 82 and 83, and these pins fit into guide holes 8 formed on the right side of seat frame 12.
4,85, lock pin 5 on the left side
6 and 57 to slide within the guide hole.

The seat longitudinal tilt mechanism 10 configured as described above is operated as follows.

The seat frame 12 is assumed to be in a parallel position as the initial position, as shown in FIG. In FIG. 4, when the handle knob 24 is operated and the handle 14 is rotated clockwise, the release piece 36 presses the actuation piece 44 of the front lock plate against the biasing force of the tension spring 50. Lift up the actuation piece 44. Therefore, the front lock plate 16 is
Rotating counterclockwise around the pin 40, the teeth 38 on the lower surface of the front lock plate are separated from the lock pin 56 of the front link 54, freeing the front link.

Here, the seated person applies his/her own weight as a load F to the seat frame 12 while pressing the handlebar 14.
Since the connecting link 62 is rotating, the load F is
is transmitted to the front link 54 via. Therefore, the free front link 54 rotates clockwise around the pin 58 against the biasing force of the tension spring 72, and the lock pin 56 at the tip moves to the right while descending.

In the embodiment, five teeth 38 are formed, and the lock pin 56 is in the initial position with the leftmost tooth 38a.
However, by rotating the handle 14, it can be moved below the central tooth 38c (see FIG. 5). The rotation angle of the front lock plate 16 is adjusted depending on the magnitude of the load F applied by the seated person, and the tooth below which the lock pin 56 moves is determined.

After that, when the rotational torque applied to the handle knob 24 is removed, due to the biasing force of the tension spring 50,
The handle 14 rotates counterclockwise to return to its initial position, and at the same time, the front lock plate 16
rotates clockwise around pin 40. Then, as shown in FIG. 6, the central tooth 38c becomes
The front lock plate 16 is engaged with the lock pin 56, thereby locking the front lock plate 16.

During operation of the handle 14, as is clear from FIG. 5, the lock pin 57 of the rear lock plate is
engages with the tooth 39a on the right end, and the rear lock plate 17 remains locked.

As described above, the lock pin 56 of the front link mechanism 20 is engaged with the center tooth 38c, and the lock pin 57 of the rear link mechanism 21 is engaged with the right end tooth 39a, so that each lock plate 16, 17 is locked. In this state, as shown in FIG. 6, the seat frame 12, that is, the seat cushion 13 (see FIG. 1) on the seat frame,
It is set in a forward tilted position.

In this state, when the handle 14 is next rotated counterclockwise, the release piece 36 presses the rear lock plate actuating piece 45 to release the tension spring 51.
is lifted against the biasing force of Therefore, the rear lock plate 17 rotates clockwise around the pin 14, and the teeth 39a move away from the lock pin 57, thereby freeing the rear link 55.

Here, as in the above case, since the load F is applied to the seat frame 12, the rear link 55 rotates counterclockwise around the pin 59, as shown in FIG. 57 moves to the left while descending.

Assume that the lock pin 57 is moved to below the second tooth 39b from the right by controlling the load F.
Thereafter, when the rotational torque applied to the handle 14 is removed, the release piece 36 returns to the horizontal initial position due to the biasing force of the tension spring 51, and at the same time,
The rear lock plate 17 is around the pin 41,
The locking pin 57 rotates counterclockwise, and the locking pin 57
b to lock the rear lock plate (see Fig. 8). Then, as shown in FIG. 8, compared to FIG. 6, the rear side is lowered and the seat cushion 13 is set at an inclined position with a gentler inclination angle.

As mentioned above, when the handle 14 is rotated in a predetermined direction, the corresponding lock plate is unlocked. Then, after adjusting the load applied to the seat frame and moving the lock plate below the desired tooth, the rotation torque of the handle 14 is removed, and the seat frame 12 is tilted in the front direction or the rear direction. be done. Therefore, the seat cushion 13 is tilted at a desired angle, and an optimal seating posture can be obtained.

Thus, in this invention, a single handle 14
Depending on the direction of rotation, the inclination toward the front and the inclination toward the rear can be set arbitrarily, improving operability. In addition, compared to the conventional configuration, which requires two handles, this design only requires one handle, which simplifies the configuration, does not give a complicated impression, and improves the appearance. improved.

Furthermore, with this invention, by pulling up or pushing down the handle 14, the seat cushion can be raised or lowered without tilting.

For example, assume that the seat frame 12 is positioned in the parallel state shown in FIG. In this state, as described above, the biasing force of the tension springs 50 and 51 causes the actuating pieces 44 and 45 to move toward the release piece 3.
6, and the release pieces are located horizontally.

If the handle 14 is pulled up against the biasing force of the tension springs 50 and 51 (see FIG. 9), the handle swings clockwise around the swing pin 34 and rises. Then, as shown in FIG.
1, counterclockwise or clockwise, respectively (see Figure 11). Then, similarly to the above, each tooth 38a of the lock plates 16, 17
39a is separated from the lock pins 56, 57,
Lock plates 16 and 17 become free at the same time.

Since the downward load F is applied to the seat frame 12, the links 54 and 55 move the lock pins 56 and 57 at their tips toward the handle 14, that is, toward the center, and move down by the same amount. Then, the lock pins 56, 57 control the load F and move the lock pins 56, 57 to any same position, for example, the center tooth 38.
c and 39c, respectively.

After that, except for the pulling force of the handle 14, the biasing force of the tension springs 50, 51 acts on the actuating pieces 44, 45, so that the lock plates 16, 17 are returned to their initial positions, and the actuating pieces 44, 45 are returned to their initial positions.
presses the handle downward, and the handle returns to the initial position shown in FIG. Then, as shown in FIG. 12, the lock pins 56 and 57 are engaged with the central teeth 38c and 39c, and the lock plate 1
Lock 6,17.

As described above, when the handle 14 is pulled up, the front and rear links 54, 55 are lowered by the same amount, and the seat frame 12 is lowered without tilting, thereby performing a so-called parallel shift.

When performing parallel shift, in the conventional configuration, 2
This design allows for parallel shifting by pulling up a single handle 14, as opposed to having to operate multiple handles simultaneously. Therefore, in this invention, parallel shifting can be performed quickly and easily, and operability is dramatically improved.

Note that instead of the pulling operation, as mentioned above,
The longitudinal tilt mechanism 10 may be configured to cause a parallel shift by pressing down on the handle 14.

In the embodiment, only the operation of lowering the seat frame 12 to tilt or shift the seat cushion 13 in parallel has been described. However, if the lock plates 16 and 17 are unlocked without applying a downward load, the link 5
4 and 55 rise while moving the lock pins 56 and 57 in a direction away from the handle 14 by the biasing force of the tension springs 72 and 73. It is obvious that the seat frame 12 will rise.

The above-mentioned embodiments are for illustrating this invention, and are not intended to limit this invention in any way, and any modifications, modifications, etc. made within the technical scope of this invention are also included in this invention. Needless to say.

[Effect of idea]

As mentioned above, according to the front-rear tilt mechanism according to this invention, depending on the direction of rotation of a single handle,
Tilt to the front side and tilt to the rear side can be set quickly and easily, improving operability.

Furthermore, when the handle is pulled up or pushed down, the front and rear links are always lowered by the same amount, so that a so-called parallel shift can be performed. In other words, by raising and lowering a single handle,
Parallel shifting can be performed quickly and easily, and the operability of parallel shifting is dramatically improved.

Furthermore, since only one handle is required, the structure is simplified and an appearance that does not give a complicated impression can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the longitudinal tilt mechanism according to this invention, Fig. 2 is an exploded perspective view of the handle, Fig. 3 is a sectional view of the handle shaft taken along the line - of Fig. 9, and Fig. 4. Figures 8 through 8 are front views of the front and rear tilting mechanisms showing various operating states when tilting the seat cushion, and Figures 9 and 10 are taken along the line - in Figure 4 before and after the handle is pulled up. 11 and 12 are front views of the longitudinal tilt mechanism in various operating states when shifting the seat cushion in parallel. 10... Front and rear tilt mechanism, 12... Seat frame, 13... Seat cushion, 14... Handle, 16, 17... Lock plate, 20, 2
1...Link mechanism, 24...Handle knob, 26
...Handle shaft, 28...Connection shaft,
29... Long hole, 30... Connection pin, 34... Swing pin, 36... Handle release piece, 38,3
9... Teeth of lock plate, 40, 41... Pin (center of rotation of lock plate), 44, 45... Operating piece of lock plate, 48... Support piece, 50,
51... tension spring (biasing means), 54, 55...
Link, 56, 57...Lock pin, 62, 63
...Connection link, 72, 73...Tension spring (biasing means).

Claims (1)

[Claims for Utility Model Registration] A shaft whose rear end is rotatably attached to the central part of one side of the seat frame loaded with seats and can be raised and lowered; a release piece having a plurality of teeth on the lower surface thereof, the handle having a plurality of teeth on its lower surface, disposed in the front-rear direction at the center of one side of the seat frame across the shaft of the handle, and one end remote from the shaft of the handle; is rotatably attached to the seat frame, and the depressable actuating piece of the release piece engages with front and rear lock plates provided at the other end of the handlebar adjacent to the shaft, and with corresponding teeth of the lock plate. The front and rear link mechanisms each have a link with a lock pin at one end that locks the lock plate, and a connecting link that arranges the link so that the rising height of the link can be adjusted. a first biasing means for biasing the lock pin to engage the tooth of the corresponding lock plate; and a second biasing means for biasing the actuating piece of each lock plate in one direction of release, the shaft of the handle being rotation, or
When raised and lowered, the release piece presses the actuating piece of the corresponding lock plate, rotates the corresponding lock plate, moves the teeth of the lock plate away from the lock pin, and tilts the seat back and forth to free the lock plate. mechanism.