KR101781405B1 - A half-bath machine equipped with a hinge coupling device capable of embedding a heater wire - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a half-seam machine provided with a hinge coupling device capable of embedding a heater wire. More specifically, the body portion with the upper side opened can be completely closed by using the first upper cover, the second upper cover for sliding movement and the hinge rotation, and the upper back which is turned backward or hinged forward, When the upper backrest connected to the lower back is easily lifted and lowered, the footrests connected by the lower backrest and the hinge rod are also folded or unfolded so that the user can enjoy the half body bath in a sitting position or a comfortable lying position And the upper back is hingedly rotated about the lower back by the side hinge engaging part connecting the upper and lower backrests to each other and is folded forward so as to close the upper part of the body part, And can be operated in a rearward direction so that the foot And a hinge coupling device capable of burying a heater wire to prevent electric wires from being exposed to the outside when the upper back is rotated in the hinge with respect to the lower backrest so that the electric wire connected to the heating part is buried along the side surface of the upper back, .
To this end, the present invention provides a lower backrest comprising: a lower back; An upper backrest provided with a heat generating portion on a backrest surface and connected to a lower backrest; And a hinge pivoting bush inserted into the insertion hole formed on both side surfaces of the lower backrest. The hinge pivoting bushing is inserted into the hinge pivoting bush and connected to the heat generating portion of the upper back portion to form a passage through which the electric wire located inside the upper back portion can pass A panel cover having a wire insertion tube at an upper portion thereof, a back panel connected to one side surface of the panel cover, and a back panel connected to both side surfaces of the upper and lower backs to interconnect the upper and lower backs, And a side hinge engaging portion for hinge-connecting the lower back portion so that the upper back portion is tilted backward with the lower back portion, or the upper back portion rotates independent hinges relative to the lower back portion and closes an upper portion of the opened body portion. And a hinge coupling device capable of embedding the hinge.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a half-bath machine equipped with a hinge coupling device capable of embedding a heating wire,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a half-seam machine provided with a hinge coupling device capable of embedding a heater wire. More specifically, the body portion with the upper side opened can be completely closed by using the first upper cover, the second upper cover for sliding movement and the hinge rotation, and the upper back which is turned backward or hinged forward, When the upper backrest connected to the lower back is easily lifted and lowered, the footrests connected by the lower backrest and the hinge rod are also folded or unfolded so that the user can enjoy the half body bath in a sitting position or a comfortable lying position And the upper back is hingedly rotated about the lower back by the side hinge engaging part connecting the upper and lower backrests to each other and is folded forward so as to close the upper part of the body part, And can be operated in a rearward direction so that the foot And a hinge coupling device capable of burying a heater wire to prevent electric wires from being exposed to the outside when the upper back is rotated in the hinge with respect to the lower backrest so that the electric wire connected to the heating part is buried along the side surface of the upper back, .

Half-bathing is a bathing method that emphasizes health laws that keep your hair cold and your feet warm, allowing you to effectively eliminate the cold aura of your body without giving your body a large burden.

The body temperature of the upper body tends to be higher than that of the lower body in the case of an ordinary person, and when half bathing is carried out, the convection phenomenon occurs between the warm blood of the lower half body and the cold blood of the upper body, and the body temperature is balanced.

Therefore, the blood circulation is good and the contracted blood vessel is opened, and the blood flows well, and the blood pressure is lowered. In addition, the waste and toxins accumulated in the body are discharged together with sweat, so the condition of the body improves. It is especially good for those who have stiff muscles, shoulders, arthritis, obesity, back pain, dysmenorrhea, cold, diabetes, stress,

As a device for enjoying such a half-bath, recently, a dry half-sickness machine which heats air in a half-bath machine has been released. Such a dry half-bath machine does not use liquid such as water, so it is advantageous in cleaning, draining, have.

However, when the conventional half-seated-type bath is not used, the opening formed in the upper part of the bathtub can not be covered with the cover, and is left as it is so that dust and foreign matter flow into the bathtub. Since it is located on the upper part of the tub frame, there is a problem in that it occupies a lot of space due to the fact that the object can not be stored at the time of moving.

Further, even if the backrest is fixed or the backrest is turned backward, the range of the angle of the backrest is small and the user can not take a comfortable posture.

When the backrest is separated into two stages, the electric wires of the heat generating units provided in the respective backrests are easily exposed to the outside, resulting in apparent safety problems.

Prior Art Document: KR Patent Registration No. 10-1674323 (published on November 2, 2016)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a hinge mechanism for a hinge, which comprises a body portion with an opened upper side as a first upper cover, a second upper cover for sliding movement and hinge rotation, The lower backrest and the footrest connected by the hinge rod are also folded or folded together when the upper backrest connected to the lower backrest is lifted or raised to the rear, Or can enjoy half-bathing in a comfortable lying position, and the upper back is hingedly rotated about the lower back by the side hinge engaging portion interconnecting the upper and lower backrests and folded forward to close the upper portion of the body portion , A rearward-raised motion to allow the user to be in a state in which he can lean back And the electric wire connected to the heating part provided on the upper back is embedded in the inside along the side surface of the upper back so that the electric wire is not exposed to the outside when the upper back is hinged to the lower back, And a hinge coupling device capable of embedding the hinge coupling device.

In order to accomplish the above object, according to the present invention, there is provided a half-bath apparatus including a hinge coupling device capable of embedding a heating wire, the apparatus comprising: a lower back having a heating part on a back surface; An upper backrest provided with a heat generating portion on a backrest surface and connected to a lower backrest; And a hinge pivoting bush inserted into the insertion hole formed on both side surfaces of the lower backrest. The hinge pivoting bushing is inserted into the hinge pivoting bush and connected to the heat generating portion of the upper back portion to form a passage through which the electric wire located inside the upper back portion can pass A panel cover having a wire insertion tube at an upper portion thereof, a back panel connected to one side surface of the panel cover, and a back panel connected to both side surfaces of the upper and lower backs to interconnect the upper and lower backs, And a side hinge engaging portion for hinging the lower back portion so that the upper back portion is tilted backward together with the lower back portion or the upper back portion rotates independently of the lower back portion and hermetically closes an upper portion of the opened body portion.

In addition, in the central portion of the backrest connection panel of the surface having the panel cover, the electric wire embedding groove cut in the longitudinal direction is formed so that the electric wire connected to the heat generating portion is inserted into the electric wire embedding groove and the electric wire connected to the heat- And to prevent exposure to light.

In addition, a through hole is formed in a central portion of one side surface, a first fixing portion provided on the lower outer side of the upper back portion, a through groove formed on the central portion of one side in the same shape as the first fixing portion, And a second latching part protruded downward from the first latching part by a predetermined distance and having a predetermined length extending downward from the second latching part, And a backrest lock unit including a lock bar having a magnetic body at a lower surface on which the second locking part is located and performing a locking operation and a releasing operation between the upper and lower backrests can do.

According to the present invention, the half-life machine can be sealed, the volume can be reduced, the transportation and storage can be facilitated, and the user can enjoy half-bathing in a sitting position or a comfortable lying position.

Also, since the electric wire connected to the heat generator provided in the back is not exposed to the outside, the beauty and safety can be enhanced.

FIG. 1 is a perspective view showing a half-seamed bath capable of adjusting the angle of a footrest and a backrest according to a preferred embodiment of the present invention,
2 is a view showing a state in which the upper back is erected and the backrest locking part,
3 is a view showing an operation state of the second upper cover,
4 is a view showing a second top cover and a backrest for rotating the hinge,
FIG. 5 is a view illustrating a use state of a half-seamed bath capable of adjusting an angle of a footrest and a backrest according to a preferred embodiment of the present invention,
6 is a view showing a cylinder and a hinge coupling portion,
7 is a view showing a backrest angle adjusting device including a hinge rod,
8 is a view showing a state of use of the side hinge engaging portion,
9 is a side view showing a side hinge coupling portion,
10 is a view showing a backrest locking device;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be variously modified by those skilled in the art.

FIG. 1 is a perspective view of a half-seamed apparatus capable of adjusting the angle of a footrest and a backrest according to a preferred embodiment of the present invention, FIG. 2 is a view illustrating a state where a top back is raised and a backrest locking portion, FIG. 4 is a view showing a second upper cover and a backrest which are turned by a hinge, FIG. 5 is a view showing the state of use of the angle adjustable half-seam according to a preferred embodiment of the present invention, 7 is a view showing a backrest angle adjusting device including a hinge rod, FIG. 8 is a view showing a state of use of the side hinge coupling portion, FIG. 9 is a side view of the side hinge portion, Fig. 10 is a view showing a backrest locking device. Fig.

1 to 7, the body part 10, the first upper cover 20, the second upper cover 30, and the second upper cover 30 are integrally formed, A seat back 60, a footrest 70, a first hinge engaging part 80, a second hinge engaging part 90, a hinge rod 100, a stopper 70, A side hinge engaging part 200 including a backrest locking part 110, a reinforcing plate 120, a cylinder 130, and a hinge turning bush 210, a panel cover 220, a back link connecting panel 230, 300).

First, the footrest 70 according to the present invention and the half-seamable unit capable of adjusting the angle of the backrest comprise a first upper cover 20, a second upper cover 30 for sliding movement and a hinge rotation, And the upper backrest 50 that is turned backward or hinged forward can be used to completely close the door as shown in FIG. 1, thereby reducing the volume of the half-body, thereby facilitating transportation and storage.

2, the lower backrest 40 and the footrest 70 connected by the hinge rod 100 are also unfolded when the upper backrest 50 connected to the lower backrest 40 is lifted or raised backward Or folded so that the user can enjoy half-bathing in a sitting position or in a comfortable lying position.

The upper back (50) is hingedly rotated about the lower back (40) by the side hinge joint (200) interconnecting the upper and lower backrests (50, 40) The upper portion of the body portion may be folded forward to close the upper portion of the body portion or may be raised to the rear so that the user can lean against the back portion. So that the electric wire is not exposed to the outside when the upper back is rotated in the hinge with respect to the lower back.

In the present invention, when the upper back (50) is pivoted rearward or forward, the lower back (40) connected to the upper back (50) also hinges together to perform a backward tilting or standing operation. A description will be given of an operation in which the upper back portion 50 is also turned up or raised when the lower back portion 40 is tilted backward or forwardly with respect to the lower back portion 40 for convenience.

Hereinafter, the footrest 70 according to the preferred embodiment of the present invention and the constituent elements constituting the backrest angle-adjustable half-seam machine will be described in detail.

1 and 3, a space is formed in the body 10 so that the user can enter the body 10 to perform a half-bath, the upper side of the body 10 is open, Door openings are provided on both sides of the body 10 so that the user can enter and exit the body 10.

The half-life machine according to the present invention is a dry half-life machine, and a heating unit capable of radiating far-infrared rays is provided inside the body part 10 by means of a hot wire, a heat emitting bulb, .

3 and 4, the first upper cover 20 is fixed to one side of the body 10 positioned in the opposite direction of the upper backrest 50, The upper part is closed. The upper surface of the first upper cover 20 is provided with a control panel 16 for controlling the heating unit 14 including temperature setting and driving time of the heating unit 14.

Referring to FIG. 3, the second upper cover 30 includes a body 10 having a first upper cover 20 and a second upper cover 20, And is further provided so as to cover a part of the upper open portion in addition to the upper open portion.

3, the second upper cover 30 includes a first upper cover 20 and a second upper cover 20. The second upper cover 30 includes a first upper cover 20, a first upper cover 20, A part of the cover 30 is pulled out or pulled out of the first upper cover 20 to perform opening and closing operations with respect to the upper part of the opened body part 10. [

4, the other part of the second upper cover 30 folds forward or hinders to the upper part of the opened body 10, Up and down operation to the opening portion.

Even if the second upper cover 30 slides out completely from the first upper cover 20 and is pulled out, the entire upper body 10 is not closed, and the upper back 50, As shown in FIG. 1, the entire opened body 10 can be completely closed when the body 10 is folded forward by a hinge rotation.

2 and 4, an arc-shaped cutout 32 is formed at the other end of the second upper cover 30 which rotates in a hinge so that when the user enters the inside of the body 10, Allowing the upper body to be positioned inside the incision to maintain a comfortable posture.

Referring to FIGS. 4 and 5, the sliding guide 34 supports the second upper cover 30 from below and serves as a guide when the second upper cover 30 performs the sliding motion in the forward and backward directions And is provided on both inner side surfaces of the body portion 10.

Referring to FIG. 4, the lower back portion 40 includes a heating portion 14 such as a heating piece for emitting far-infrared rays on an inner back surface to which the user can lean, 40 are hinged by the hinge rod 100 as described below, and the user can move the hinge rod 100 by the hinge rod 100, It is turned backward to take a posture to be able to lie down, or to stand forward to take a posture in which the user can sit.

The side rests 42 of the lower backrest 40 are in contact with both sides of the edge of the seat portion 60 when the lower backrest 40 is folded and hinged so as to hold the user in a sitting posture, And stops the backrest 40 from being folded forward.

4 and 5, the upper back portion 50 is provided with a heating portion 14 on the inner back surface like the lower back portion 40 as shown in FIG. 4, And the upper end of the upper backrest 50 are hinged to rotate together with the lower backrest 40 to be hinged backward or upright.

Meanwhile, when the lower back (40) is in the form of a chair in which the user can sit, and the lower back (40) is hinged further forward in the fixed state, the second upper cover (30) 2 upper cover 30 to close an upper part of the opened body 10.

5, the seat portion 60 is provided with a heating portion 14 having the same shape as that provided on the lower back portion 40 on the upper surface thereof, and is connected to the lower back portion 40 So that the lower backrest 40 performs the sliding movement by a predetermined distance in the forward and backward directions when the hinge is turned forward or backward.

Referring to FIG. 5, the footrest 70 is connected to the seat portion 60, and the lower backrest 40 is hingedly rotated together with the lower backrest 40 to perform an operation of unfolding or folding, If you have a calf and feet to enjoy a comfortable half bath.

6 and 7, the first hinge coupling part 80 is provided at the center of the inner surface of the footrest 70 in the form of a cut-away central part, and the rear end of the hinge rod 100 described below Inserted into the cut portion of the hinge coupling portion 80, and coupled by a fastening device such as a link or a bolt.

6 and 7, the upper portion of the second hinge coupling portion 90 is connected to the outer side of the lower back portion 40, the lower portion extends downward from the upper portion, And the head portion 104 of the hinge rod 100 described below is inserted into the cutout portion 92 and engaged.

5, 6 and 7, the hinge rod 100 has a rear end coupled to the first hinge coupling part 80, and a head part 104 coupled to the second hinge coupling part 90, The lower back 40 and the footrest 70 are coupled to each other so that the lower backrest 40 and the footrest 70 are hinged together as the hinge rod 100 reciprocates linearly, And forms a predetermined slope.

6 and 7, the head 104 of the hinge rod 100 coupled to the second hinge engaging portion 90 is located on the outer side of the front portion of the incision formed in the second hinge engaging portion 90 So that a predetermined portion protrudes.

6 and 7, the stopper 110 is provided on the second hinge coupling part 90 and is disposed at a position spaced upward by a predetermined distance from a position where the head part 104 of the hinge rod 100 is engaged Is provided across the cutout formed in the second hinge engagement portion.

5, when the lower back portion 40 is hingedly rotated backward, the protruded head portion 104 of the hinge rod 100 is caught by the lower portion of the stopper 110, (40) has a predetermined slope and supports the user so as to be able to maintain a state where the user can lie down.

4 and 5, the reinforcing plate 120 is engaged with the lower portion of the rear surface of the body portion 10 and is engaged with the stopper 110 when the lower back portion 40 is completely turned backward, 40 and the lower portion of the hinge rod 100 supporting the lower portion of the backrest 40. [

Specifically, when the lower back portion 40 is tilted backward, the outer surface of the lower back portion 40 is brought into contact with the upper surface of the reinforcing plate 120 so that the reinforcing plate 120 supports the lower back portion 40 upward .

5 and 6, the cylinder 130 is provided below the seat portion 60 and connects the cylinder connecting portion 134 and the seat portion 60 provided inside the body portion 10 to each other .

As shown in FIG. 6, one or more cylinders 130 connecting the cylinder connecting rod 134 and the seat portion 60 are arranged side by side at a predetermined distance, so that the lower back portion 40 and the foot portion 70 When the hinge is rotated and folded or unfolded, the piston provided inside the cylinder 130 is drawn out or drawn in, and the lower back 40 and the footrest 70 are suddenly opened or folded by adjusting the hinge rotation speed by the buffering action So that it can be flexibly operated.

8, the side hinge coupling portion 200 interconnects the upper and lower backrests 50 and 40 so that the upper backrest 50 hinges against the lower backrest 40, As shown in Fig. 2, the user can perform the operation of raising the rear portion so as to be in a state in which the user can lean against the back, as shown in Fig.

4 and 8, the side hinge coupling part 200 is formed such that the electric wire connected to the heat generating part 14 provided in the upper backrest 50 is embedded in the inside along the side surface of the upper backrest 50 So as to prevent the electric wire from being exposed to the outside when the upper back part makes the hinge rotation with respect to the lower back part.

8 and 9, the side hinge coupling portion 200 includes a hinge turning bush 210, a panel cover 220, and a back link connecting panel 230. [

8 and 9, the hinge rotation bush 210 is inserted into the insertion hole formed in the side surface of the upper back portion, which is fitted to the outer circumferential surface of the wire insertion tube 224 provided in the panel cover 220 described below, So that the backrest 50 can rotate with respect to the lower backrest 40.

8 and 9, the panel cover 220 is coupled to one side of the backrest connection panel 230 described below, and the upper portion of the panel cover 220 is inserted into the inside of the hinge rotation bush 210 And a wire insertion tube 224 connected to the heating part of the upper back and formed with a passage through which electric wires located in the upper backrest 50 can pass.

8 and 9, the hinge pivoting bush 210 is fitted to the outer circumferential surface of the wire insertion tube 224 and inserted into the insertion holes formed on both sides of the upper backrest 50, And the electric wire positioned inside the upper backrest 50 is connected to the heating portion of the upper backrest 50 through the inside of the wire insertion tube 224 so that the electric wire 230 is hinged to the upper backrest 50, So that the wire is not exposed to the outside.

8 and 9, a panel cover 220 is coupled to one side of the backrest connection panel 230 and the backrest connection panel 230 is coupled to the upper backrest 50 and the lower backrest 40, Respectively, to interconnect the upper and lower backrests 50 and 40 with each other.

8 and 9, a longitudinally incised wire embedding groove 234 is formed in the center of the backrest connecting panel 230 on the surface of the back cover connecting panel 230 on which the panel cover 220 is attached, So that a wire connected to the heating part of the upper back is inserted into the wire embedding groove 234 so that the wire is not exposed to the outside.

2 and 10, the backrest locking portion 300 includes a first fixing portion 310, a second fixing portion 320, and a locking base 330. The backrest locking portion 300 includes a backrest locking portion 300, The upper and lower backrests 50 and 40 are connected to each other to be fixed so that the upper and lower backrests 50 and 40 can be moved backward or forward .

That is, when the backrest lock portion 300 is in the locked state, the upper backrest 50 is independently hinged so as not to be folded forward.

Further, when the backrest locking portion 300 is in the released state, the upper backrest can be folded forward or backward with respect to the lower backrest.

2 and 10, a first fixing part 310 of the backrest locking part 300 is formed with a through groove 312 at a central portion at one side and is provided at a lower outer side of the upper backrest 50. [

2 and 10, the second fixing part 320 of the backrest locking part 300 has the same shape as that of the first fixing part 310 and has a through groove 312 formed at a central part of one side thereof, (40).

Referring to FIGS. 2 and 10, the locking base 330 includes a first locking portion 340 protruding from an upper end thereof, a second locking protrusion 340 protruding downward from the first locking portion 340 by a predetermined distance, And an insertion portion 360 inserted into or withdrawn from the second fixing portion 320 is provided in the second locking portion 350 and the second locking portion 350 is provided in the second locking portion 350. [ A magnetic body 370 is provided

The upper back 50 is provided with a magnetic coupling member (not shown) for coupling the magnetic body 370 provided on the locking base 330 with a magnetic force to fix the position of the locking base 330 .

A predetermined length between the first locking part 340 and the second locking part 350 is inserted into the through hole formed in the first fixing part 310 so as to move up and down.

Hereinafter, the operation of the backrest locking part 300 will be described with reference to FIGS. 2 and 10. FIG.

The locking action of the backrest lock 300 of the backrest lock 300 to engage both backrests in a state in which the upper backrest 50 is erected so that the user can rest his back against the lower backrest 40, The first locking part 340 is caught on the upper surface of the first fixing part 310 and the downward movement of the locking part 330 is restricted.

At this time, the second engaging part 350 is also engaged with the upper surface of the second fixing part 320, and the insertion part 360 is inserted into the through hole of the second fixing part 320 to perform the locking operation.

The unlocking operation for allowing the upper backrest 50 to rotate in a hinge with respect to the lower backrest 40 is such that the locking arm 330 is raised upward and the second locking portion 350 of the locking arm 330 is moved upward The upward motion is restricted while being caught by the lower surface of the fixing portion 310. [

At this time, the inserting portion 360 is pulled out of the through hole of the second fixing portion 320 and performs the releasing operation.

When the backrest locking part 300 is released, the locking part 330 of the locking part 330, which is raised upward, does not slip downward due to its own weight, The magnetic bodies 370 provided on the lower surface and the magnetic coupling members provided on the upper back 50 are coupled to each other by the magnetic force and the lock base 330 is fixed in the upper position and is maintained in the released state .

It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10 - Body part 20 - First upper cover
30 - a second upper cover 40 - a lower backrest
50 - upper backrest 60 - seat portion
70 - Footrest 80 - First hinge coupling part
90 - second hinge coupling part 100 - hinge rod
110 - stopper 120 - reinforcing plate
130 - cylinder 200 - side hinge coupling part
210 - Hinge pivot bush 220 - Panel cover
230 - Backrest connection panel 300 - Backrest locking part

Claims (3)

A lower back portion having a heating portion on a back surface;
An upper backrest provided with a heat generating portion on a backrest surface and connected to a lower backrest; And
A hinge rotation bush inserted into the insertion holes formed on both sides of the lower back,
A panel cover which is inserted into the inside of the hinge rotation bush and has a wire insertion tube connected to the heating part of the upper back and formed with a passage through which electric wires located in the inside of the upper back can pass,
A backrest connecting panel which is coupled to one side of the panel cover, and which is coupled to both side surfaces of the upper and lower backrests to interconnect the upper and lower backrests,
/ RTI >
A side hinge engagement portion for hinging the upper back portion and the lower back portion so that the upper back portion is tilted backwardly together with the lower back portion or the upper back portion is rotated independently of the lower back portion to close the upper portion of the opened body portion,
And a hinge coupling device capable of filling the heating cable. The method according to claim 1,
A cable embedding groove cut in the longitudinal direction is formed in the center portion of the backrest connection panel of the surface having the panel cover, so that a wire connected to the heat generating portion is inserted into the wire embedding groove and the wire connected to the heating portion provided on the upper back is not exposed to the outside Avoid
And a hinge coupling device capable of embedding the heater wire. The method according to claim 1,
A first fixing portion provided at a lower portion of an outer side of the upper back portion,
A second fixing part formed in the same shape as the first fixing part and having a through groove formed in a central portion at one side thereof,
A second latching portion protruding from the first latching portion at a predetermined distance downward and having a predetermined length extending downward from the second latching portion and inserted into the second latching portion, And a locking member having a magnetic body is provided on a lower surface on which the second locking part is located,
And a backrest locking portion for performing a locking operation and a releasing operation between the upper and lower backrests,
And a hinge coupling device capable of filling the heating cable.

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