JPH07194458A - Lumber support adjusting device - Google Patents

Abstract

PURPOSE:To avoid an inoperable state by setting the can abutting part of a swing arm so as to intersect the shaft center direction of a shaft, and forming a can body so as to form a can groove at the bottom part of a groove formed in the radiating direction of the shaft. CONSTITUTION:The cam body 24 in an adjusting mechanism 21 which performs the position adjustment of a lumber plate 20 in forward/backward directions is constituted in such a way that the groove 27 is formed in the radiating direction of the shaft 22, and the cam groove 28 at the bottom part of the groove 27 in the radiating direction of the shaft 22. Also, the lumber plate 20 is mounted on the swing arm 50, and the turning center shaft part 54 on a mounting table side is formed as the can abutting shaft part 56 by bending so as to protrude forward, and the intermediate part of the cam abutting shaft part 56 is formed as an engaging part 57 engaged with the can groove 28 by bending downward. Therefore, the cam abutting shaft part 56 of the swing arm 50 is located at right angles to a horizontal part 51, and the turning direction of the cam abutting shaft part 56 is set in upward/downward directions, and the can abutting shaft part 56 can be prevented from coming off the groove 27, which avoids the inoperable state.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a lumbar support adjusting device.

[0002]

2. Description of the Related Art A conventionally known Japanese Patent Publication No. 55-49 discloses that
A mounting base having an adjusting mechanism provided on a side portion of the skeleton frame of the backrest part, and a swing arm having a lumbar plate provided at the center, and the adjusting mechanism includes a left-right shaft provided on the mounting base. A lumbar support adjusting device composed of a cam body rotatably provided on the shaft, a ratchet mounted on a rotating arm provided on the shaft for preventing reverse rotation of the cam body, and a latch engaged with the ratchet. Is described.

[0003]

In the above-mentioned known example, since the cam contact shaft portion of the swing arm is simply brought into contact with the outer circumference of the cam body, the cam contact shaft portion is dislocated from the outer circumference of the cam body.
There is a problem that there is a fear of becoming inoperable and a problem that the cam body reverses. As for the problem of reversing the cam body, it is well known to provide a latch and a ratchet, but it is necessary to form two types of latches so that an adjusting mechanism can be attached to either the left or right of the backrest. There are challenges.

[0004]

It is an object of the present invention to avoid an inoperable state and share parts.

[0005]

Therefore, according to the present invention, the mounting base 5 and the mounting base 60 having the adjusting mechanism 21 provided on the left and right sides of the skeleton frame 4 of the backrest portion 3, and the mounting base 5 and the mounting base. A swing arm 50 having both left and right ends attached to the swing arm 60 and a lumbar plate 20 provided at the center of the swing arm 50. The adjusting mechanism 21 is provided on the outer bracket 6 and the inner bracket 7 of the mount 5. A cam body 24 formed with a shaft 22 in the left-right direction and a cam groove 28 rotatably provided on the shaft 22 and engaged with a cam contact shaft portion 56 of the swing arm 50.
And a ratchet 25 for preventing reverse rotation of the cam body 24 attached to a rotating arm 26 provided on the shaft 22,
And a latch 23 with which the ratchet 25 engages, the cam contacting shaft portion 56 of the swing arm 50 intersects with the axial center direction of the shaft 22, and the cam body 24 includes the shaft. The lumbar support adjusting device has a cam groove 28 formed at the bottom of a groove 27 formed in the radial direction 22 and the latch 23 is a lumbar support adjusting device formed on the left and right side surfaces of the cam body 24.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.
Is a seat used for vehicles and the like, 2 is a seat portion, 3 is a backrest portion, and 4 is a skeleton frame of the backrest portion 3. The skeleton frame 4 is formed of a hollow pipe in an inverted U shape, and a mounting base 5 is fixed to a desired portion on either one of the left and right sides of the frame 4. The mount 5 includes an outer bracket 6 and an inner bracket 7. The outer bracket 6 is integrally formed with upper and lower plate portions 9 and 9 projecting inward at upper and lower ends of the outer side plate 8 in the front-rear direction. And bulges 10 and 10 that bulge up and down respectively. An insertion hole 13 is formed substantially in the center of the outer side plate 8, and a boss 14 that protrudes inward is formed at the peripheral edge of the insertion hole 13. The inner bracket 7 is formed with an insertion hole 16 corresponding to the insertion hole 13 in an inner side plate 15 parallel to the outer side plate 8 and a boss 17 protruding toward the outer bracket 6 on the peripheral edge of the insertion hole 16.

Therefore, between the outer bracket 6 and the inner bracket 7, there is provided an adjusting mechanism 21 for adjusting the position (adjusting the pressing force) of the lumbar plate 20 which will be described later. The adjusting mechanism 21 rotatably mounts a cam body 24 with a latch 23 on a shaft 22 in the left-right direction, and a rotating arm 26 with a ratchet 25 that engages with the latch 23 is fixed to the outside of the cam body 24. Then configured. The cam body 2
4 has a groove 27 formed in the radial direction of the shaft 22, and a plurality of cam grooves 28 are formed at the bottom of the groove 27 with different thicknesses in the radial direction of the shaft 22. The right and left sides of the cam groove 28 are formed with regular circular flanges 29 protruding in the radial direction. The latch 23 having an engagement step portion 30 is provided on each side surface of the collar 29. A different diameter portion 31 is provided at a predetermined portion of the shaft 22, and the base portion of the rotating arm 26 is integrally formed on the different diameter portion 31 by resin molding. A mounting fitting shaft 32 parallel to the shaft 22 is formed at the tip of the rotating arm 26. Although the tip of the ratchet 25 is formed narrower as it reaches the tip, as is well known, a double straddle 33 protruding in the rotation direction of the rotating arm 26 is formed on the base, and the base of the double straddle 33 has the aforementioned A fitting groove 34 into which the mounting fitting shaft 32 is fitted is formed. The fitting groove 34 is formed in a circular shape that is narrower than the diameter of the attachment fitting shaft 32 and partially opened, and the two straddle portions 33 are continuously provided from the open portion, and the fitting groove 34 is formed into the attachment fitting shaft 32. The ratchet 25 is formed so as to rotate about the mounting fitting shaft 32 but not to be pulled out when the fitting is made. 35 is a large diameter portion provided on the fitting shaft 32, and 36 is a ratchet 25
Is a spring that urges the engagement step portion 30 of the latch 23 to engage.

Insertion hole 40 at the center of the left and right latches 23
An annular recess 41 is formed on each of the peripheral edges of the rotary arm 26, and an annular recess 42 is formed on the outer peripheral edge of the mounting portion of the shaft 22 of the rotating arm 26. Then, the cam body 24 is inserted into the shaft 22, the inner end of the shaft 22 is inserted into the insertion hole 16 of the inner bracket 7, and the boss 17 of the inner bracket 7 is fitted into the annular recess 41 of the latch 23. , The insertion hole 13 of the outer bracket 6 is inserted into the shaft 22, and the boss 14 around the insertion hole 13 is attached to the rotating arm 2.
6 into the annular recess 42 and then the outer bracket 6
Is fixed to the inner bracket 7. Reference numeral 43 denotes a protrusion formed by being cut and raised so as to protrude inward, and four protrusions 43 are formed around the insertion hole 13, and the lower two protrusions 43 are the rotating arms 26 attached to the shaft 22. A spring 4 for urging the ratchet 25 to engage the latch 23.
4 is retained, and the remaining projections 43 are attached to the rotary arm 26.
It acts as a stopper that regulates the rotation of the. Reference numeral 45 is a handle provided on the outer end of the shaft 22, annular projection 46 is an annular projection formed around the annular recess 41, annular projection 4
7 is an annular protrusion formed around the annular recess 42, and 48 is a screw 48 for fixing the outer bracket 6 to the inner bracket 7.
Is.

Therefore, the lumbar plate 20 is
It is attached to a swing arm 50 formed by a torsion bar or the like. In the swing arm 50, the lumbar plate 20 is attached to a central horizontal portion 51 at an intermediate portion on the left and right sides by an arbitrary attachment structure, and the left and right sides of the horizontal portion 51 are formed with a bent portion 52 having a chevron shape in a front view at the top and bottom, and bent at the left and right. Horizontal outer horizontal portions 51 are respectively formed following the portions 52, and the end portions of the left and right outer horizontal portions 51 are bent to form arm portion arm portions 53, and the upper ends of the arm portions 53 have the same axis center. Are formed on the rotation center shaft portions 54 and 55, and the rotation center shaft portion 54 on the side of the mounting base 5 is bent so as to protrude forward to form the cam contact shaft portion 56, and the cam contact shaft portion 56. The middle portion of the is bent downward to form an engaging portion 57 that engages with the cam groove 28 of the cam body 24. Therefore, when viewed from the side, the swing arm 50 includes the horizontal portion 51 and the bent portion 5.
2, the arm portion 53 and the rotation center shaft portions 54 and 55 are located on substantially the same plane, the cam contacting shaft portion 56 is located so as to form an angle substantially perpendicular thereto, and the horizontal portion 51 and the bending portion The portion 52 and the arm portion 53 are the rotation center shaft portions 54 and 55.
The cam contacting shaft portion 56 rotates in the front-back direction, and the cam contacting shaft portion 56 rotates in the vertical direction. Reference numeral 58 is a bent portion of the cam contact shaft portion 56 and the rotation center shaft portion 54, and 59 is a bush having a small diameter portion 64.

Therefore, the skeleton frame 4 on the opposite side of the mounting base 5 is provided with the mounting base 60, and the mounting base 60 is formed with a mounting hole 62 in which a passage groove 61 is formed by cutting out a part thereof.
The bush 63 is a bush having a small diameter portion 64. The inner side plate 15 of the inner bracket 7 is formed with a gourd-shaped insertion hole 67 into which the cam contacting shaft portion 56 of the swing arm 50 is inserted. The gourd-shaped insertion hole 67 is formed at a position rearward and upward of the insertion hole 16, and connects the lower large diameter hole 68 of the lower part and the upper small diameter hole 69 of the upper part to each other to form a gourd shape. The lower large-diameter hole 68 and the upper small-diameter hole 69 of the gourd-shaped insertion hole 67 have a relative relationship between the outer periphery of the cam body 24 (the collar 29) and the gap 70 formed between the bulging portion 10,
The cam contact shaft portion 56 is movable in the left and right direction in the lower large diameter hole 68 in the gap 70, and the upper small diameter hole 69 is such that the cam contact shaft portion 56 is located in the groove 27 and the rotation center shaft portion. The bush 59 of 54 is configured to fit.

That is, in the swing arm 50, when the side of the rotation center shaft 55 is a free end, the cam contact shaft 56 can be inserted into the gap 70 through the lower large-diameter hole 68 of the gourd-shaped insertion hole 67 and left and right. Then, the rotation center shaft 55 is rotatably attached to the mounting base 60, the rotation center shaft 54 is moved to the upper small diameter hole 69, and the bush 59 is fitted thereinto, while the cam contact shaft 56 is formed.
The engaging portion 57 is configured to enter the groove 27 when the is rotated about the rotation center shaft portion 54.

[0012]

The present invention has the above-described structure. The rotating arm 26 is attached to the different diameter portion 31 of the shaft 22 by resin integral molding, and the ratchet 25 is attached to the attachment fitting shaft 32 of the rotating arm 26.
The fitting groove 34 is pushed into the fitting groove 34 so that the two straddle portion 33 expands, and the fitting groove 34 is fitted, and the spring 36 is attached between the ratchet 25 and the rotating arm 26. In this case, the ratchet 25 only rotates about the mounting fitting shaft 32, and the ratchet 25 and the straddle 3
Since the base portion of 3 is formed to be narrower than the diameter of the mounting fitting shaft 32, once the fitting groove 34 of the ratchet 25 is fitted into the mounting fitting shaft 32, the rotating direction is different from the pulling direction. It does not come off, making the installation process extremely easy. Also,
By simply reversing the front and back of the ratchet 25, it can be used for both the left and right adjusting mechanisms 21.

As an example of the mounting process of the adjusting mechanism 21, the spring 44 is inserted through the shaft 22, and the shaft 22 in this state is locked at both ends of the spring 44 by the lower protrusions 43. Through the insertion hole 13 of the outer bracket 6 and then the cam body 24 through the shaft 22.
The inner end of the shaft 22 is inserted into the insertion hole 16 of the inner bracket 7, and in this state, the outer bracket 6 is fixed to the inner bracket 7 with a screw 48, and the adjusting mechanism 21 is attached to the outer bracket 6 and the inner bracket 7.

In this case, bosses 14 and 17 are formed on the periphery of the insertion hole 13 of the outer bracket 6 and the insertion hole 16 of the inner bracket 7 through which the shaft 22 is inserted.
The annular recess 4 is formed on the outer surface of the rotating arm 26 and the latch 23.
1. Since the annular recess 42 is formed, the annular recess 41,
The boss 14 and the boss 17 are fitted in the annular recess 42 and mounted on the shaft 22 without the need for a bush as in the conventional case.
The parts and installation process are simplified. In addition, the annular recess 41
Since the annular projection 46 and the annular projection 47 are formed on the periphery of the annular recess 42, respectively, the rotating arm 26
The annular projection 46 formed on the latch 23 provided on the side surface of the cam body 24 slides on the inner surface of the cam body 24, and the annular projection 47 slides on the inner surface of the outer side plate 8 on the outer surface of the rotating arm 26. Since the annular projection 46 of the latch 23 formed on the side surface is in sliding contact with the inner surface of the inner side plate 15 of the inner bracket 7, and the sliding contact surface is a line contact, each component operates without resistance. Also,
The outer bracket 6, the rotating arm 26, and the cam body 2 are brought into contact with each other by the annular projection 46 and the annular projection 47.
Since the 4 and the inner bracket 7 are assembled at a predetermined position, the mounting work becomes easy.

In the swing arm 50, the inner bracket 7 has a large-diameter lower large-diameter hole 68 and a large-diameter lower large-diameter hole 68 into which the cam abutting shaft portion 56 is movable in the left-right direction.
5 which is in communication with the bush and is inserted into the rotation center shaft portion 54.
Since the gourd-shaped insertion hole 67 including the small-diameter upper small-diameter hole 69 into which 9 is fitted is formed, before the rotation center shaft portion 55 is mounted on the mounting base 60, the cam contact shaft portion 56 is axially oriented. So as to be parallel to the axial direction of the shaft 22 (a in FIG. 9, FIG. 10 and FIG. 11), and then the tip of the cam contacting shaft portion 56 is attached to the lower large diameter hole 68 of the gourd-shaped insertion hole 67. And into the lower large-diameter hole 68 up to the middle of the cam contact shaft 56 (FIGS. 12 and 13). In this state, the tip of the cam contacting shaft portion 56 is inserted so as to face the inside of the bulging portion 10 of the outer bracket 6 (FIG. 9, B, FIG. 14 and FIG. 15). When the bent portion 58 between the rotation center shaft portion 54 and the rotation center shaft portion 54 passes through the inside of the lower large diameter hole 68 and is further pushed, the cam contacting shaft portion 56 becomes a direction intersecting with the shaft 22, and the rotation center shaft portion. 54 becomes parallel to the shaft 22 (C in FIG. 9,
16 and 17).

In this state, the cam contacting shaft portion 56 is located in the gap 70 between the inner surface of the upper and lower plate portions 9 of the outer bracket 6 and the outer periphery of the cam body 24, and is movable in the axial direction of the shaft 22. Therefore, the swing arm 50 is moved to the left and right, and the bush 63 inserted into the rotation center shaft portion 55 is fitted into the mounting hole 62 from the passage groove 61 of the mounting base 60, so that the rotation center shaft portion 55 side Complete the installation. Even in this state, since the rotation center shaft 55 is slidable in the left-right direction with respect to the bush 63, the entire swing arm 50 is moved left and right so that the cam contact shaft 56 matches the cam body 24. Let
The cam contact shaft portion 56 is made to face above the groove 27 of the cam body 24 (C in FIG. 9, FIG. 16 and FIG. 17). Next, while pushing the bush 59 of the rotation center shaft portion 54 so as to fit into the upper small diameter hole 69, the tip of the cam contact shaft portion 56 is rotated toward the cam body 24 side around the rotation center shaft portion 54. Bush 5
9 is fitted in the upper small diameter hole 69, the cam contact shaft portion 56 is located in the groove 27 of the left and right cam bodies 24, and the engaging portion 57 is formed in the cam body 2.
4 is engaged with the cam groove 28.

In the above mounting process of the swing arm 50, the relationship between the lower large diameter hole 68 and the upper small diameter hole 69 of the gourd-shaped insertion hole 67 and the bulging portion 10 of the outer bracket 6 is as follows.
When the bent portion 58 or the rotation center shaft portion 54 is in the lower large diameter hole 68, a gap 70 into which the cam contact shaft portion 56 can be inserted is formed between the outer periphery of the cam body 24 and the bulging portion 10. When the rotation center shaft portion 54 is located in the upper small diameter hole 69, the tip of the cam contact shaft portion 56 is inside the outer side plate 8, and the engagement portion 57 of the cam contact shaft portion 56 is located between the grooves 27. Since the engaging portion 57 is not disengaged from the groove 27 of the cam body 24 once the mounting is completed, the positioning is easy and the mounting is easy.

Further, on the outer periphery of the cam body 24, since a regular circular collar 29 is formed so as to deepen the groove 27, the engaging portion 57 of the cam contact shaft portion 56 is rotated to the uppermost side. Even if it does not come off from the collar 29 of the cam body 24, therefore, the inoperable state is prevented. It should be noted that the collar 29 is formed on the outer periphery of the cam body 24, and the attaching step does not change, and the gap 70 is formed only between the upper outer periphery of the collar 29 and the inner surface of the bulging portion 10. When the rotation center shaft portion 55 side is a free end, the rotation center shaft portion 54 can be inserted into the mount 5 through the lower large diameter hole 68 of the gourd-shaped insertion hole 67, and the rotation center shaft portion 55 can be rotated. When the rotation center shaft portion 54 is moved to the upper small-diameter hole 69, the engaging portion 57 cannot be disengaged from the flange 29, and the bending portion 58 of the swing arm 50 is fixed.
Passes through the inside of the large hole 68 on the lower side, and the cam contacting shaft portion 56 becomes a direction intersecting with the shaft 22.
Is parallel to the shaft 22 (C in FIG. 9, FIG. 16 and FIG. 17), the cam contacting shaft portion 56 is in the gap 70 between the inner surface of the bulging portion 10 of the outer bracket 6 and the peripheral edge of the collar 29. Since the swing arm 50 is moved to the left and right, the bush 63 inserted into the rotation center shaft portion 55 is attached to the mounting base 60. The swing arm 50 is fitted into the mounting hole 62 through the passage groove 61 to complete the mounting on the rotation center shaft portion 55 side. In this state, the entire swing arm 50 is moved to the left and right so that the cam contact shaft portion 56 matches the cam body 24. Move the cam contact shaft 56 to the collar 29.
Face the cam body 24 between the collar and the collar 29 (see FIG. 9,
16 and 17), while pushing the bush 59 of the rotation center shaft portion 54 so as to fit into the upper small diameter hole 69, the tip of the cam contact shaft portion 56 is moved to the center of the rotation center shaft portion 54. The bush 59 is rotated to the side of the cam body 24 to move the bush 59 to the upper small diameter hole 6
9, the cam contact shaft portion 56 is located between the left and right flanges 29, and the engaging portion 57 engages with the cam groove 28 of the cam body 24.

In the mounting process of the swing arm 50, the rotation center shaft 55 is slid only with respect to the mounting base 60, and the cam contact shaft 56 is a large-diameter lower hole of the gourd-shaped insertion hole 67. Since it is only inserted from 68 and then rotated, it can be attached without twisting to an angle different from the used state or deformation of bending, and there is no strength design considering attachment other than the used state, Not only is the design easy, but since there is no twisting or bending deformation during the mounting process, the swing arm 50 reliably rotates back and forth, and the lumbar plate 20 surely acts evenly on the left and right.

When the vehicle is seated on the vehicle seat 1 and the operation handle 45 is rotated, the shaft 22 rotates,
The rotation arm 26 is rotated by the rotation of the shaft 22, and the ratchet 25 attached to the tip of the rotation arm 26 pushes the latch 23 to rotate the cam body 24 around the shaft 22, and the ratchet 25 is moved by the elasticity of the spring 44. Return to the original.
When the cam body 24 rotates, when the lumbar plate 20 is at the rearmost position, the cam groove 28 acts to cause the cam contact shaft portion 56 to move.
Rotates upward about the rotation center shaft portion 54, and the cam contact shaft portion 5
6 swings the swing arm 50 forward around the rotation center shaft portion 54 and the rotation center shaft portion 55, and the rotation center shaft portion 54 and the rotation center shaft portion 55 rotate the arm portion 53 forward to cause the lumbar plate to rotate. Push 20 forward and seat 1 for vehicle
Strongly adjust the degree of pressure on the waist and back of the seated person.

In the embodiment, when the operation handle 45 is further rotated, the lumbar plate 20 is pushed forward, and when it is moved to the foremost position, it is retracted. In this case, the swing arm 50 includes the left and right rotation center shaft portions 54 and the rotation center shaft portion 55.
Are arranged on the same line, and the rotation center shaft portion 54 and the rotation center shaft portion 55 are mounted on the mounting base 5 and the mounting base 60, respectively. It is transmitted to the movement of the lumbar plate 20 without loss, and acts reliably. Further, since the rotation direction of the cam contact shaft portion 56 is the vertical direction with respect to the center of the rotation center shaft portion 55, the rotation width of the cam contact shaft portion 56 can be increased without increasing the thickness in the front and rear of the seat 1. Therefore, the amount of forward and backward movement of the lumbar plate 20 can be increased.

Then, the outer bracket 6 of the mounting base 5
Forms the bulging portion 10 and the protrusion 43 and the like symmetrically in the vertical direction,
Similarly, since the inner bracket 7 has the gourd-shaped insertion holes 67 formed in the top and bottom, it can be attached to either the left or right of the skeleton frame 4. Further, since the cam body 24 has the latches 23 formed on the side surfaces of the left and right flanges 29, respectively, it is attached to either the left or right side of the skeleton frame 4. Therefore, the number of parts is reduced and the cost is reduced.

[0023]

[Effect] According to the present invention, the mounting base 5 and the mounting base 6 having the adjusting mechanism 21 provided on the left and right sides of the skeleton frame 4 of the backrest portion 3 are provided.
0, a swing arm 50 having left and right ends attached to the mount 5 and the mount 60, and the swing arm 5
The adjustment mechanism 21 includes a lumbar plate 20 provided at the center of the shaft 0, and a left-right shaft 22 provided on the outer bracket 6 and the inner bracket 7 of the mounting base 5.
And a cam groove 2 rotatably provided on the shaft 22 and engaged with a cam contact shaft portion 56 of the swing arm 50.
8, a cam body 24 forming a shaft 8, a ratchet 25 mounted on a rotating arm 26 provided on the shaft 22 for preventing reverse rotation of the cam body 24, and a latch 23 with which the ratchet 25 engages. The cam contact shaft portion 56 of the swing arm 50 intersects the axial direction of the shaft 22, and the cam body 24 has a cam groove 28 at the bottom of a groove 27 formed in the radial direction of the shaft 22. Since it is the lumbar support adjusting device having the above-mentioned structure, the cam contacting shaft portion 56 is prevented from coming off the groove 27 and preventing an inoperable state. Further, according to the present invention, since the latch 23 is a lumbar support adjusting device formed on each of the left and right side surfaces of the cam body 24, the cam body 24 can be attached to the adjusting mechanism 21 provided on either the left or right side of the backrest 3. Also, the latch 23 can be used, parts can be commonly used, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat.

FIG. 2 is an exploded perspective view of an adjustment mechanism and a swing arm.

FIG. 3 is a perspective view of the same attached state.

FIG. 4 is a vertical sectional front view.

FIG. 5 is a side view of a cam body.

FIG. 6 is a front view of the same.

FIG. 7 is a side view of the ratchet and the rotating arm.

FIG. 8 is a side view of the same mounting state.

FIG. 9 is a vertical sectional front view of a swing arm in a mounted state.

FIG. 10 is a perspective view of a swing arm in a mounted state.

11 is a side view of the main part of FIG.

FIG. 12 is a perspective view of a swing arm in a mounted state.

13 is a side view of the main part of FIG.

FIG. 14 is a perspective view of a swing arm in a mounted state.

FIG. 15 is a side view of the main part of FIG.

FIG. 16 is a perspective view of a swing arm in a mounted state.

FIG. 17 is a side view of the main part of FIG.

FIG. 18 is a perspective view of a swing arm in a mounted state.

FIG. 19 is a side view of the main part of FIG.

FIG. 20 is a perspective view showing a state in which the engagement portion is engaged with the cam body.

FIG. 21 is a front view of the same section.

FIG. 22 is a vertical sectional front view.

FIG. 23 is an operation state diagram of the cam body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Seat for vehicles, 2 ... Seat part, 3 ... Back part, 4 ...
Skeleton frame, 5 ... Mounting base, 6 ... Outer bracket, 7 ...
Inner bracket, 8 ... Outer side plate, 9 ... Upper and lower plate parts, 10 ...
Bulging portion, 13 ... insertion hole, 14 ... boss, 15 ... inner side plate,
16 ... Insertion hole, 17 ... Boss, 20 ... Lumber plate,
21 ... Adjusting mechanism, 22 ... Shaft, 23 ... Latch, 24
... Cam body, 25 ... Ratchet, 26 ... Rotating arm, 27
... Groove, 28 ... Cam groove, 29 ... Tsuba, 30 ... Engaging step portion, 31
... different diameter part, 32 ... mounting fitting shaft, 33 ... two-sided part, 34 ... fitting groove, 35 ... large diameter part, 36 ... spring, 40 ... insertion hole, 41
... annular recess, 42 ... annular recess, 43 ... protrusion, 44 ... spring, 45 ... operation handle, 46 ... annular protrusion, 47 ... annular protrusion, 48 ... screw, 50 ... swing arm, 51 ... horizontal portion, 52 ... bent portion , 53 ... Arm portion, 54 ... Rotation center shaft portion, 55 ... Rotation center shaft portion, 56 ... Cam contact shaft portion, 57 ...
Engagement portion, 58 ... Bent portion, 59 ... Bushing, 60 ... Mounting base, 61 ... Passage groove, 62 ... Mounting hole, 63 ... Bushing, 6
4 ... small diameter part, 67 ... gourd-shaped insertion hole, 68 ... lower large diameter hole,
69 ... Upper small diameter hole, 70 ... Gap.

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[Procedure amendment]

[Submission date] March 14, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Figure 4]

[Fig. 2]

[Figure 3]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

FIG. 11

[Fig. 13]

[Figure 9]

[Figure 10]

[Fig. 12]

FIG. 14

FIG. 15

FIG. 16

FIG. 17

FIG. 18

FIG. 21

FIG. 19

FIG. 20

FIG. 22

FIG. 23

Claims (2)

[Claims] 1. A mounting base 5 and a mounting base 60 having an adjusting mechanism 21 provided on the left and right sides of the skeleton frame 4 of the backrest 3.
A swing arm 50 having left and right ends attached to the mount 5 and the mount 60, respectively, and the swing arm 50.
The adjusting mechanism 21 includes a lumbar plate 20 provided in the center of the mounting bracket 5, and the adjusting mechanism 21 includes a left-right shaft 22 provided on the outer bracket 6 and the inner bracket 7 of the mounting base 5.
And a cam groove 2 rotatably provided on the shaft 22 and engaged with a cam contact shaft portion 56 of the swing arm 50.
8, a cam body 24 forming a shaft 8, a ratchet 25 mounted on a rotating arm 26 provided on the shaft 22 for preventing reverse rotation of the cam body 24, and a latch 23 with which the ratchet 25 engages. The cam contact shaft portion 56 of the swing arm 50 intersects the axial direction of the shaft 22, and the cam body 24 has a cam groove 28 at the bottom of a groove 27 formed in the radial direction of the shaft 22. Lumber support adjustment device formed. 2. The lumbar support adjusting device according to claim 1, wherein the latches 23 are formed on the left and right side surfaces of the cam body 24, respectively.