KR910004816Y1 - Table for vehicle seat - Google Patents

Abstract

No content.

Description

Retractable table

1 to 10 is an embodiment of the present invention, Figure 1 is a partially cut perspective view.

2 is a perspective view of the projection of the body and the guide case.

3 is an exploded perspective view of the link table portion.

4 is an exploded perspective view of the operating part.

5 is a side cross-sectional view.

6 is a plan view.

7 degrees front view.

8 is an operational state diagram of the link table and the operating unit.

9 is a state in which the guide case is leveled when the seat back is folded back.

10a, b or operating state diagram of the operating unit.

* Explanation of symbols for main parts of the drawings

1: retractable table body 2: body

3: link type table part 4: operating part

5: indentation hole 6: incision

7: hinge portion 8: protrusion

9: arc-shaped hole 10: guide case

11: Orehole 12: Information board

13: hinge portion 14: protrusion

15: screw hole 17: adjustment bolt

18: support panel 19: table bar

20: connecting plate 21: hinge

22a, 22b: upper hole 23a, 23b: lower hole

24: long groove 25: screw hole

26: support plate 27: bolt

28a, 28b: screw hole 29a, 29b: hole

30a, 30b: Screw 31: Stop plate

32: long groove 33: screw hole

35: control panel 37a, 37b: screw pin

38: spring 40: support plate

42: operation roller 43: operating body

44: toothed gear 45a, 45b: upper, lower elastic stopper

48: screw 51: working piece

53a, 53b: arm, male hinge part 54a, 54b: stop part

55a, 55b: female, male hinge 57a, 57b: coil spring

58: operation button 61: pin

62a, 62b: female, male rod 63a, 63b: pin

65a, 65b: Bracket 66: Pin

68: guide roller 69: guide groove

71: screw 73a, 73b: wire

74: coil spring 75: seat back

The present invention relates to a simple table for seating, and in particular, it is connected to the seat back of a vehicle, a train, an aircraft, etc., and is formed by linking the table so that the table can be stored in and out. A convenient retractable table.

Conventionally, the simple table of the seat back has been laid out in various ways, but most of them are exposed to the outside, which not only looks aesthetically deteriorated, but also deteriorates the seat's elegance. If the seat back is tilted backwards during long trips, the table installed on the seat back will be tilted at the same time as the backrest to form a slope so that food cannot be placed on the table and the table is installed on the armrest of the seat instead of the seat back. In this case, the table stays horizontal when the backrest is flipped, but the backrest is located above the table, which raises the user's anxiety and is restrained by the backrest when the table is returned to its original position. The drawback is the inconvenience between the passengers. Dawn will.

In addition, when the vehicle is suddenly stopped or crashed, the upper body of the passenger is reflected in a forward direction (seat back side). At this time, the upper body of the passenger hits the seat back or the table installed in the armrest of the seat. That is, the above-mentioned table is not a storage type but is a folding type, and since it is an integrated flat table, it is inevitably necessary to keep the table in use even though the table must be folded in case of an accidental accident. There was a flaw such as the upper body hitting the table and being injured.

The present invention devised to solve such a conventional drawback, by installing a link-type table in the seat back to be buried to be buried in normal use can maximize the space, and also make the appearance of the seat back beautiful By simply pulling the linked table stored in the seat back when using it as a table, the table is formed and when not in use, it is automatically stored by pressing a button, so the use of the table is very convenient. When the seat back is flipped backward, the linked table can be kept horizontal regardless of the tilt of the seat back, so that all weather tables can be provided.In case of an accident such as sudden stop or collision, the upper body of the passenger Even if it hits, the linked table is inserted and stored in the seat back instantly. I do not have to worry about hurt the body of the passenger is highly practical in its benefits are diverse.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 10 is an embodiment of the present invention, the reference numeral 1 is a retractable table body, the retractable table body (1) is the body (2), the link table table part (3), the operating part (4) It is composed.

The body (2) is plated after forming a "a" shaped case with an iron plate.

The body 2 forms a concave hole 5 in one upper side, a cutout 6 is formed in an upper side of the concave hole 5, and a hinge 7 is formed in the lower side.

A plurality of projections 8 and arc-shaped holes 9 are formed around the hinge portion 7, respectively, on both inner side surfaces of the recessed hole 5.

Reference numeral 10 is a guide case molded and plated with an iron plate, and penetrates so that the inlet hole 11 is formed, and the guide plate 12 made of synthetic resin is fixed to the upper inner surface of the inlet hole 11 with screws 16. Installing and forming a hinge portion 13 on the lower one side.

In addition, the upper plate of the guide case 10 is formed longer than the lower plate so that one side is formed in an inverted trapezoid shape.

A plurality of protrusions 14 are formed to be bent and protruded about the hinge portion 13 on both outer sides of the guide case 10, and the screw holes 15 are drilled on both sides thereof.

Therefore, the guide case 10 is installed in the outgoing hole 5 of the body 2, but the hinge 2 and 13 of the body 2 and the hinge parts 7 and 13 of the guide case 10 are installed by a hinge. To form.

In addition, the protrusions 8 of the body 2 and the protrusions 14 of the guide case 10 are mutually matched, and the screw holes 15 of the guide case 10 are passed through the arc-shaped holes 9 of the body 2. Screw onto the adjustment bolt (7).

On the other hand, the link table 3 is composed of a support panel 18, a table bar 19, a connecting plate 20, a hinge 21, respectively.

The support panel 18 is installed on both sides of the table bar 19 and penetrates forward and backward, respectively, and drills a pair of upper and lower holes 22a and 22b and lower and lower holes 23a and 23b, respectively. Screw head grooves are formed in one lower hole 23a, 23b, and screw holes are formed in the other lower hole 23a, 23b, respectively.

In addition, a pair of long grooves 24 are drilled in the lower plate of the support panel 18.

Thereafter, a stop plate 26 having a pair of screw holes 25 formed on the upper surface of the lower plate of the support panel 18 is seated thereon, and a pair of bolts 27 pass through the long groove 24 to the screw holes 25. Screwed together.

The support panel 18 uses a stainless material, and may be a panel plated on an iron plate.

The table bar 19 forms a pair of screw holes 28a and 28b on both sides, respectively, and uses N, D, and F materials to give light weight and robustness.

The support panel 18, the table bar 19, and the connecting plate 20 respectively form inclined surfaces on both lower edges.

A pair of holes 29a and 29b are drilled in the connecting plate 20, respectively.

Therefore, when combining the support panel 18, the table bar 19, and the connecting plate 20, the screw 30a is connected to the hole 29a of the connecting plate 20 and one side upper hole 22b of the supporting panel 18. Threaded to the threaded hole (28b) of the table bar 19 through the).

At this time, a dash (') is indicated in the corresponding sign so as to easily explain the signs of the other support panel 18 and the table bar 19.

Therefore, after one side of the support panel 18 and the table bar 19 is fixed to one side of the connecting plate 20, the other side of the connecting plate 20 is connected to the other supporting panel 18 'and the table bar 19'. Another screw (30b) as described above when integrally fixing the support panel 18, the table bar 19, and the connecting plate 20 in this way connects 8-10 pairs in series.

On the other hand, the hinge 21 is fixed to the stop plate 31 integrally on the upper surface of one hinge piece (21a), the other hinge piece (21b) after forming a pair of long grooves (32) and a pair of screw holes (330) And the adjusting plate 35 having the holes 34 formed thereon to fix the hinge 21 to the upper surface of the hinge piece 21b with a screw 36.

Therefore, the hinge 21 is installed in the lower hole 23b and 23a 'of the support panel 18 and the other support panel 18' by mandrel with screw pins 37a and 37b, respectively. The heads of (37a) and (37b) are buried in the screw head grooves so as not to protrude, and the threaded parts are screwed to the other side.

The hinges 21 are also interconnected in series as described above.

Thereafter, one end of the pair of coil springs 38 is fixed to the hole 34 of the adjustment plate 35 of the hinge 21 and the other end is fixed to the screw 30a to impart elasticity to the hinge 21.

Therefore, the support plate (39) is provided on the foremost side of the link-type table part (3), which is connected to each other by the support panel (18), the table bar (19), the connecting plate (20), and the hinge (21). 40) is fixed and two holes 41 are drilled in the rearmost table bar 19, respectively.

Therefore, the link type table part 3 is inserted into the outgoing hole 5 of the body 2 through the outgoing hole 11 of the guide case 10, wherein the shaft in which the hole 41 is formed is the body ( 2) is inserted into the link table (3) is bent to the "b" shape to be positioned below, the support plate 40 is in contact with the inlet hole 11 of the guide case 10 for further insertion. Prevent it.

On the other hand, the operating unit 4 is composed of an operation roller 42, a pair of operating bodies 43, a gear gear 44, the upper, lower resilient stoppers 45a, 45b, respectively.

Screw holes 46 are formed at both ends of the operation roller 42, respectively, and matched with holes 47 drilled in both sides of the body 2, and then screwed with screws 48, respectively.

Reference numeral 49 is a washer, which is installed between the screw 48 and the body 2 so that the screw 48 can also be integrally rotated when the operation roller 42 rotates.

The pair of square working body 43 is integrally fixed to both ends of the working roller 42, and the shaft hole 50 in the center, and the operating piece 51 in each corner portion protrudes in the radial direction.

The toothed gear 44 is integrally fixed to one end of the operation roller 42 and forms a shaft hole 52 in the center thereof.

Therefore, the actuating piece 51 of the actuating body 43 fixed to both ends of the actuating roller 42 serves to push the hinge 21 upward when the link type table part 3 is moved.

The upper and lower resilient stoppers 45a and 45b are each bent at one end of the female and male hinge portions 53a and 53b, and the other end is formed at the stop portions 54a and 54b. The female and male hinges 55a and 55b are protruded on the inner side to face 53a and 53b, respectively.

Further, holes 56a and 56b are drilled in the middle both sides of the upper and lower resilient stoppers 45a and 45b, respectively, at which time the stop portions 54a and 54b and the female and male holes are provided. After being positioned between the hinges 55a and 55b, the upper elastic stopper 45a and the lower elastic stopper 45b are elastically connected to the coil springs 57a and 57b.

Reference numeral 58 denotes an operation button that forms a hinge portion engaging hole 59 on one side thereof and drills the pin hole 60 in the transverse direction so as to pass through the hinge portion engaging hole 59.

Thereafter, the female and male hinge parts 53a and 53b of the upper and lower resilient stoppers 45a and 45b are mated with each other and then inserted into the hinge part engaging hole 59 of the operation button 58. The male and male hinge parts 53a and 53b are mandated by the pin 61 through the pin hole 60 to be integrated.

Reference numerals 62a and 62b denote an arm and a male rod, and each end of the female and male rods 62a and 62b is attached to the female and male hinges 55a and 55b of the upper and lower elastic stoppers 45a and 45b. A mandrel is installed by pins 63a and 63b, respectively.

That is, the female rod 62a is provided with a pin 63a on the male hinge 55b, and the male rod 62b is mounted with a pin 63b on the female hinge 55a.

On the other hand, after protruding the bracket (65a) (65b) formed with shaft holes (64a) (64b) on one side of the "a" shaped upper side lower surface of the body (2) of the female, male rod (62a) (62b) The other ends are joined together to be aligned with the shaft holes 64a and 64b and then installed with a mandrel with a pin 66.

At this time, the stop portions 54a and 54b of the upper and lower resilient stoppers 45a and 45b prevent the rotation of the operation roller 42 by biting the gear 44, and the operation button 58 It protrudes out of the body 2.

Reference numeral 67 denotes an operation button mounting hole for smooth operation of the operation button 58.

Reference numeral 68 denotes a guide roller, which forms guide grooves 69 on both sides of the outer circumferential surface, and forms screw holes 70 at both ends thereof.

The guide roller 68 is fixed to the lower part of the body 2 with a screw (not shown), and at this time, a guide roller is installed between the screw 71 and the side wall of the body 2 by installing a washer (not shown). To allow sliding (68) during rotation

Reference numerals 73a and 73b are wires, and the coil springs 74 are connected between the wires 73a and 73b.

Thereafter, the wire 73a is fixed to the operation roller 42, and the other wire 73b is wound around the guide groove 69 of the guide roller 68, and then at the rear end of the link table 3. The storage table main body 1 is completed by fixing to the hole 41 of the formed table bar 19. As shown in FIG.

Accordingly, the retractable table body 1 is buried in the seat back 75 so that only the upper part of the body 2 is exposed, and the guide case 10 is also exposed to the rear of the backrest 75.

Referring to the effect of the present invention configured as described above are as follows.

When using the retractable table installed in the seat back 75 during travel, as shown in Figs. 10 (a) and 10 (b), the operation button 58 protruding from the upper part of the body 2 is in the direction of the arrow. When pressed inwards as described above, the stop portions 54a and 54b of the upper and lower elastic stoppers 45a and 45b are opened despite the elasticity of the coil springs 57a and 57b around the pin 66. The gear 44 is released from the stop portions 54a and 54b of the upper and lower resilient stoppers 45a and 45b so that they can be freely rotated.

At this time, the operation of the movable portion 4 will be described in detail so that it is easy to understand.

As shown in FIG. 10, when the operation button 58 is pressed, the force of the operation button 58 that is pushed in the horizontal direction is installed by the pin 61 on the operation button 58, and the upper and lower elastic stoppers 45a and 45b are installed. The female, male hinge portion (53a) (53b) is delivered to the female, male hinge portion (53a) (53b) is pushed like the operation button 58, but at this time, upper and lower elastic stopper (45a) (45b) ) Is a mandrel installed on the brackets 65a and 65b of the body 2, and is connected to the male rods 62a and 62b to form a mandrel. The lower resilient stoppers 45a and 45b are not pushed, but the brackets 65a and 65b are opened around the pin 66.

Of course, the upper and lower elastic stoppers 45a and 45b are armed, male hinges 55a and 55b, and female and male rods 62a and 62b, and are provided with male and female rods 62a and 62b. ) And the brackets 65a and 65b are installed in the mandrel, so that the upper and lower elastic stoppers 45a and 45b naturally open, and the elastic force of the coil springs 57a and 57b is generated, but the pressing Since the force is stronger than the elasticity of the coil springs (57a) (57b), the coil springs (57a) (57b) is to be increased by the gap between the upper and lower elastic stoppers (45a, 45b).

Since the stopper 54a, 54b of the upper and lower elastic stoppers 45a, 45b is separated from the toothed gear 44 by the operation of the operation part 4 as described above, the toothed gear 44 is finally free. Will become.

Therefore, since the operation part 4 disassembles the gear | gear gear 44, a user pulls the handle 39 installed in the forefront of the link type table part 3 like FIG. Take out (3) from the body (2).

At this time, when the link type table part 3 is taken out, the wires 73a and 73b connected to the rearmost part of the link type table part 3 and the link type table part 3 of the coil spring 74 are elastically downward. Since the pull-type table part 3 is pulled out, the coil spring 74 extends and the wire 73a is wound by the guide roller 68, and the guide roller 68 is also wired. 73b).

In addition, as shown in FIG. 8, the operating piece 51 of the operating body 43 fixed to both ends of the operating roller 42 is rotated, that is, any one of the operating pieces 51 formed at the corners is a linked table. When the hinge 21 is deformed by the movement of the part 3 in the folded state, the hinge pin 21a of one side of the hinge 21 pushes the operating piece 51 in the moving direction and the operating piece ( 51 is rotated together with the operation roller 42.

Therefore, since the hinge 21 of the link type table part 3 is continuously pushed and folded by the continuous rotation of the operating piece 51, the link type table part 3 is shifted in the 90 degree direction.

On the other hand, the link-type table part 3, which is out of the operating piece 51 of the operating body 43, is advanced by continuous movement. The link-type table part 3, which is out of the operating piece 51, is the guide case 10. Since the guide plate 12 of the guide plate 12 is expanded and moved, the guide plate 12 is connected to the screws 30a and 30b by the guide plate 12 and the elasticity of the coil spring 38 of the hinge 21. The mandrel-sided support panels 18 are rotated around the screws 30a and 30b to be unfolded.

When the hinge 21 is fully extended and further folded downward, when the bottom surface of one side hinge piece 21a comes in contact with the support plate 26 installed on the support panel 18, further folding is prevented, and the hinge 21a is also provided. By this, the link type table part 3 can maintain a planar shape.

Therefore, when the linked table part 3 is taken out by an arbitrary length by the above-mentioned operation, and the pressure which pressed the operation button 58 is removed, the upper and lower resilient stoppers 45a and 45b of the upper and lower resilient stoppers, as shown in FIG. The stoppers 54a and 54b are asked to hold the gear 44 in its original state.

That is, since the elasticity of the coil springs 57a and 57b connected to the upper and lower elastic stoppers 45a and 45b is generated by the removal of the external force, the upper and lower elastic stoppers 45a and 45b are connected to the pin 66. Since the aforementioned reverse operation is performed as the center, the gear gear 44 is held, and at the same time, the operation button 58 protrudes to its original state.

Therefore, since the gear 44 cannot be rotated, the operation roller 42 cannot rotate, and thus the link table 3 cannot move, so that the link table is not operated unless the operation button 58 is operated. (3) It cannot be stored by itself.

On the contrary, when storing the link table 3, when the operation button 58 is pressed, as shown in Article 8 and 10 (b), the gear 44 is upper and lower elastic stoppers 45a and 45b. Since the wire 73a, 73b and the coil spring 74 connected to the rear of the linked table part 3 pull the linked table part 3, the linked table part 3 is automatically released. It will be stored.

That is, when the link-type table part 3 is drawn out and is in a table state, the coil spring 74 is in an extended state, and thus, when the link-type table part 3 is changed to a free state, the coil spring 74 is elastic. By pulling the link type table portion (3) is to be stored in the body (2).

Therefore, when the link-type table part 3 is to be stored in the body 2, the link-type table part 3 should be switched to a free state. In this case, when the operation button 58 is pressed, the gear 44 is moved up and down. Since it is released from the elastic stopper (45a) (45b), the toothed gear 44 is placed in a state that can rotate with the operation roller 42, the operating body 43 integrally with the operation roller 42 also rotates It's in a state where it can.

In addition, the operation table 51 of the operating body 43 is pressed by the hinge 21 of the link type table part 3 as shown in FIGS. 5 and 8, and the link type table part 30 is described above. As the hinge 21 is rotated counterclockwise as the hinge 21 is accommodated by the elasticity of the coil spring 74, the operating body 43 is rotated.

In other words, the rotation of the working body 43 means that the link type table part 3 naturally moves into the body 2 to be accommodated.

Of course, when the working roller 43 and the rotating roller 42 and the gear 44 is also rotated at the same time to guide the movement of the link-type table part (3).

In order to prevent the lower end of the link table 3 from colliding with the guide roller 68 due to excessive insertion of the link table 3, a stop plate installed at the top of the link table 3 is provided. 40 is to be prevented from inserting further by being caught by the guide case (10).

At this time, when storing the link-type table 3 stops at an arbitrary position when storing the link-type table 3, the upper and lower resilient stoppers 45a are removed by removing the external force held by the operation button 58. (45b) is to hold the gear gear 44, the rotation of the operation roller 42, the gear gear 44, the operating body 43 is stopped, so that the link table (3) by the operating body 43 It will stop movement.

On the other hand, the seat back 75 is inclined at an arbitrary angle when the seat back is flipped during a long trip, so the retractable table main body 1 of the magnetic back 75 also has the angle of the seat back 75 described above. It is equally inclined.

In the case of using the retractable table body 3 in this state, even if the seat back 75 is inclined, the link type table part 3 of the retractable table body 1 should be kept horizontal so that the link type table part It is necessary to adjust (3).

When adjusting the link table 3, the guide case is removed by loosening the bolt 17 fixing the body 2 and the guide case 10 of FIG. 2 to remove the adhesion between the body 2 and the guide case 10. After the free state (10) is rotated around the hinge portion 7 and 13 of the body (2) and the guide case 10 so that the guide case 10 is positioned horizontally as in the ninth degree.

At this time, the protrusions 8 and 14 are formed in the body 2 and the guide case 10, respectively, so that the protrusions 8 and 14 rotate in a multi-stage manner when the guide case 10 is rotated. In the engaged state, unless the guide case 10 is pushed downward, they do not rotate downward due to their own weight of the guide case 10.

In addition, when the guide case 10 is rotated, the bolt 17 receives the ovum of the arc-shaped hole 9 of the body 2 so that the guide case 10 can be rotated, and the guide case 10 is horizontal. If maintained, tighten the bolt 17 to bring the body 2 and the guide case 10 into close contact with each other.

When the guide case 10 is fixed in a horizontal state, the linked table 3 may be taken out and stored in the above-described operation.

In addition, the cutout 6 formed at the upper end of the body 2 supports the upper surface of the guide case 10 so that the guide case 10 is not excessively rotated when the guide case 10 is rotated for horizontal maintenance of the guide case 10.

On the other hand, when the linked table part 3 is used, when the vehicle is suddenly stopped or collided, the upper body is momentarily leaned toward the seat back. The linked table part 3 is in contact with the upper body of the passenger and the linked table is moved by the force of the upper body. If the part 3 is not stored in the original state, the upper body of the passenger is injured.

Therefore, when the upper body of the passenger comes into contact with the link table 3 and the reflecting force acts on the link table 3, the link table 3 is forcibly received. The operating body 43 of the operating body 43 is prevented from being rotated, the operating body 43 is integrated with the operation roller 42, the operation body 43 is the operation roller 42 and The gears 44 of the operation roller 42 are integrally engaged with the upper and lower resilient stoppers 45a and 45b, so that the link table 3 cannot move, but sudden reflection is applied. When the link table (3) acts on the table (3) and the link table (3) tries to move and the gear (44) of the operation roller (42) does not rotate but is unable to withstand the reflecting force, the upper and lower elasticity As the stoppers 45a and 45b are momentarily released from the gear 44, the link table 3 is This is accommodated by expulsion.

By the storage of the link-type table portion (3) it is possible to reduce the impact of the upper body to protect the safety of the passengers.

Of course, when the above-described operation is completed in the state where the reflecting power is removed, the operating unit 4 is returned to the original state.

And, the stop plate 26 of the support panel 18 is to adjust the angle of deflection of the hinge 21, when the movement of the stop plate 26 to loosen the bolt 27 of the long groove 24 formed in the lower plate After adjusting according to the guide, tighten the bolt 27.

And, the adjustment plate 35 of the hinge 21 to adjust the deflection of the hinge 21 to maintain the horizontal of the link-type table 3, the adjustment plate 35 by the adjustment of the bolt 36, Since the front end of the adjustment plate 35 is adjusted to be able to adjust the deflection angle of the hinge 21 in contact with the stop plate (31).

Then, the connecting plate 20 and the support plate 40 of the link type table part 3 protrude slightly higher than the upper surface of the support panel 18 and the table bar 19 so that food and the like are linked table parts 3. Prevent it from falling around.

The lower side edges of the support panel 18, the table bar 19, and the connecting plate 20 are formed to be inclined so as to naturally bend to the "a" shape when the link type table part 3 emerges. In other words, each support panel 18 mutually table bar 19 between each other, the connecting plate 20 between each other is to prevent the contact between each other when bent in a "b" shape.

As such, the present invention is very convenient because it can be used as a table by burying the link type table in the seat back, and when it is not used, it is buried in the seat back so that it can be upgraded without being exposed to the outside. Even when the seat back is flipped back when traveling, the link-type table can be kept in a horizontal state so that it can be used for all-weather tables, and in addition, the safety of passengers in case of accidents can be enhanced.

Claims (1)

A plurality of cutouts 6 are formed on the upper part of the upper part of the “a” shaped case, and a hinge part 7 is formed on the lower part of the upper part of the concave hole 5, respectively. The protrusion 8 and the arc-shaped hole 9 are formed around the hinge portion 7 to form a body 2, and a plurality of hinge portions are provided at the lower portion of the guide case 10 having the projection hole 11 formed thereon. After forming (13) and the hinge portion 7 and the mandrel of the body 2, a plurality of projections 14 and the screw hole 15 on both outer sides of the guide case 10, the hinge portion 13 After forming each of the centers and engaging with the projections (8) of the body (2) at the same time through the circular bore (9) with the adjusting bolt (17) screwed into the screw hole (15) for angle adjustment, and support After forming a pair of long grooves 24 in the lower plate of the panel 18, the stop plate 26 is installed and fixed by bolts 27, and the support panel 18 is installed on both sides of the table bar 19. The support panels 18, 18 'and the table bar are connected to the support panels 18 and the other support panels 18' by the connecting screws 20 so as to be connected in series with the screws 30a and 30b. 19) (19 ') mandrel is installed, and the inclined surfaces are formed at both lower edges of the support panel 18, the table bar 19, and the connecting plate 20, respectively, and a stop plate on the upper side of one hinge piece 21a. The hinge 21 is formed by fixing the integrally 31 and forming a pair of long grooves 32 in the other hinge piece 21b and then fixing the adjustment plate 35 to the upper surface of the hinge piece 21b with a screw 36. A mandrel is installed in the lower holes 23b and 23a 'of the support panel 18 and the other support panel 18' by screw pins 37a and 37b, respectively, and the screw 30a and the adjustment plate 35 are respectively installed. The coil spring 38 is elastically connected between the two to form a link-type table part 3, and the link-type table part 3 is connected to the body 2 through the projection hole 11 of the guide case 10. Insert and install the indentation hole (5) of "ㄱ" To be bent into a shape, and the squares of the working pieces 43 protruding in the radial direction from each of the working pieces 51 at each corner are integrally fixed to both ends of the working rollers 42 so that the working rollers 42 are connected to the body. 2) After the mandrel is installed at the lower side of the inlet hole 5 side, the moving piece 51 pushes the hinge 21 upward when the link type table part 3 moves, and both female and male The female and male hinges 55a and 53b are formed to face each other on the inner surfaces on which the branches 53a and 53b and the stoppers 54a and 54b are formed, respectively. The upper and lower resilient stoppers 45a and 45b connected to the operation button 58 protruding to the outside of the body 20 are elastically installed with coil springs 57a and 57b to stop the stoppers 54a and 54b. The upper and lower resilient stoppers 45a and 45b, and the female and male rods 62a and 62b, respectively, so as to pull each other about the hinge portions 53a and 53b. Of the body (2) A mandrel is installed on the gaskets 65a and 65b to limit the spread of the stoppers 54a and 54b, and the gears 44 are integrally formed at one end of the operation roller 42 to stop the stopper 54a ( 54b) to control the rotational movement, and the guide rollers 68 having guide grooves 69 formed on both sides of the outer circumferential surface of the mandrel are installed on the lower side walls of the body 2, and then the coil spring 74 is connected to one side. The wires 73a are fixed to both ends of the operation rollers 42, and the other wires 73b are wound on both side guide grooves 69 of the guide rollers 68, respectively, and then the lowest table bars of the linked table part 3 are formed. The seat is characterized in that the fixed table body (1) is fixed to the (19), the seat table 75 is buried in the seat back body (75) so that the link table (3) is set out Retractable table for.