JPH0613331Y2 - Door opener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application of the present invention> The present invention relates to a door opening / closing device that moves a door openably and closably by four rotating shafts.

<Prior Art> For example, in an open / close door of a housing accommodating a safe, there is a possibility that a driver or the like may be inserted and damaged from the gap between the door and the opening edge of the housing in a closed state.

As a countermeasure against this, a protrusion plate is provided on the inner edge of the door so as to be located in the gap inside the housing in the closed state.
Moreover, the applicant of the present application has proposed in Japanese Utility Model Publication No. 58-34026 a door opening / closing device in which the protruding plate does not interfere with the opening edge of the housing during the opening / closing movement of the door.

That is, what is shown in FIGS.
By opening and closing the door 5 at steps 4 to 4, the end portion 6a of the protruding plate 6 fixed to the inside of the edge portion 5a of the door 5 so as to project laterally is attached to the opening edge portion 8a of the housing 7 at the time of opening and closing. In order not to interfere with each other, it moves along the curve A while wrapping around the inside of the opening edge portion 8a.

That is, the first plate 11 that is bent in an L shape is fixed to the housing 7 via the base 9. One end of the second plate 12 is rotatably connected to the one end of the first plate 11 by the first rotating shaft 1, and the other end of the first plate 11 is the third plate.
One end of the number plate 13 is rotatably connected by the second rotation shaft 2.

Further, one end of a fourth plate 14 is rotatably connected to the other end of the second plate 12 by a third rotating shaft 3, and the other end of the third plate 13 is a fifth plate. One end of the plate 15 is rotatably connected by the fourth rotation shaft 4. The other end of the fourth plate 14 and the other end of the fifth plate 15 are fixed to the door 5.

These first to fifth plates 11 to 15 are all vertical plates, and the first to fourth rotating shafts 1 to 4 are all plate numbers 11 to 1.
5 is inserted into a shaft hole formed by curling the end portion. Further, a notch 16 is provided at the center of the fifth plate 15 so as not to interfere with the fourth plate 14 and the second plate 12. The second plate 12 enters the notch 16 as the door 5 is opened.

In this door opening / closing device, the third rotating shaft 3 is the first rotating shaft 1
The fourth rotation shaft 4 rotates about the second rotation shaft 2, but the distance between the third rotation shaft 3 and the fourth rotation shaft 4 is kept constant. Since the fifth plate 15 and the fourth plate 14 are fixed to the door 5 because the door 5 is tilted, the door 5 is rotated by the first rotation shaft 1 as shown in FIG. Centering on an intersection of a straight line L1 connecting the center and the rotation center of the third rotation shaft 3 and a straight line L2 connecting the rotation center of the second rotation shaft 2 and the rotation center of the fourth rotation shaft 4 Rotate as. Since the intersection of these two straight lines changes as the door 5 is opened and closed, as shown in FIG.
The lid 5 is opened so that the lid 5 moves along the curve A from the state of entering the inside of the a so as not to interfere with the opening edge portion 8a. FIG. 9 shows a state in which the door 5 is opened to the maximum.

However, the conventional door opening / closing device having such a structure as shown in FIGS. 7 to 9 has the following drawbacks.

(A) Although the door 5 can be opened only up to the angle shown in FIG. 9 as much as possible, the operator may open the door to a larger angle without knowing it and try to open it vigorously. By doing so, the first plate 11, the fourth plate 14, and the fifth plate 15 are vertical flat plates, and the turning force for opening the door 5 is applied in the thickness direction of these flat plates, which causes deformation. In particular, since the fifth plate 15 has a large notch 16 formed in the center thereof, it is more likely to be deformed, and the door 5 cannot be closed due to the deformation of these plate.

(B) Since the fourth plate 14 and the fifth plate 15 are vertical plates and are mounted inside the door 5 occupying a large space in the vertical direction, this mounting portion inside the door 5 is a dead space. Therefore, other things (for example, emergency call button mechanism) cannot be attached to this part.

(C) Since the shaft is inserted into the shaft hole formed by curling the end portion of each plate and the shafts are rotatably connected to each other, rattling easily occurs between the shaft hole and the rotating shaft. For this reason, it is difficult to maintain accurate dimensional accuracy between the rotary shafts, and smooth opening and closing cannot be performed. Further, the machining of the shaft hole for curling the plate end portion is complicated, and the adjustment of the dimension between the shafts is extremely troublesome.

(D) The first plate 11 is screwed to the base 9 with a screw in the hole 10a, but the fourth plate 14 and the fourth plate, which are vertical plates, are used to screw the hole 10a in the center. 5th plate 1
5 becomes an obstacle, and the screwdriver must be inserted through the small gap of the notch 16 and screwed while rotating the fourth plate 15 and the fifth plate 15, which makes the assembly work extremely complicated. As a modification of such a defect, it has hitherto been disclosed in Japanese Patent Laid-Open No. Sho 56-56.
According to No. 93986, the door plate and the housing are fixed to the number plates by the first and second horizontal plates which are parallel to each other in the vertical direction, and the first and second horizontal plates are connected to each other. A door opening / closing device having a four-axis structure, which is rotatably connected by a plate, has been proposed.

<Problems to be Solved by the Present Invention> However, in the door opening / closing device of Japanese Patent Laid-Open No. 56-93986, (a) one of the first and second horizontal plates is not curved and is fixed. The connecting plate connecting the first and second horizontal plates has to be long in the horizontal direction because of the shape protruding in the vertical direction with respect to the opened door or housing, and as a result, the first and second connecting plates are formed.
The connecting plates of (1) had to be curved so as not to collide with each other in the door opening / closing operation. For this reason, when a force to open the door is applied more strongly than the limit when opening and closing the door, the first and second connecting plates that are long and curved in the horizontal direction are easily deformed, and the door cannot be closed. There was a problem.

(B) Further, since the shafts are inserted into the shaft holes formed by curling both ends of the first and second connecting plates and are rotatably connected to each other, it is difficult to obtain the processing accuracy of the shaft holes. Rattling between the shaft hole and the rotating shaft is apt to occur, which makes it difficult to maintain accurate dimensional accuracy between the rotating shafts, and smooth opening and closing cannot be performed. Further, there is a problem that the machining of the shaft hole for curling the plate end portion is complicated, and the adjustment of the dimension between the shafts is extremely troublesome.

An object of the present invention is to provide a door opening / closing device that solves these problems.

<Means for Solving the Problems> In order to solve the problems, according to the present invention, the door is fixed to an inner end portion of the housing near the door and is vertically provided in parallel with each other. A first horizontal plate (24a) having first and second shaft holes (27) and (28) respectively formed at two positions, a near position and a deep position thereof,
(24b) and the first horizontal plates (24a), (24b) fixed to the inner end of the door in the vicinity thereof, vertically spaced apart from each other and provided in parallel with each other, and at the front end of the door. Third and fourth shaft holes (39), (40) respectively drilled at two locations
Second horizontal plates (37a), (38a) each having one end, and the first horizontal plates (24a), (2
4b) is rotatably attached to the first shaft holes (27) and (27) by a first rotation shaft (31) perpendicular to the first horizontal plates (24a) and (24b). And the other end
The upper and lower second horizontal plates (37a) and (38a) have third axial holes (39) and (39) which are perpendicular to the second horizontal plates (37a) and (38a). A first connecting plate (29) rotatably attached by a rotating shaft (43) of 3 and one of the upper and lower first horizontal plates (24a), (2).
4b) is rotatably attached to the second shaft holes (28) and (28) by a second rotation shaft (34) perpendicular to the first horizontal plates (24a) and (24b). And the other end
In the fourth shaft holes (40) and (40) of the upper and lower second horizontal plates (37a) and (38a), there are first vertical plates (37a) and (38a) that are perpendicular to the second horizontal plates (37a) and (38a). A second connecting plate (30) rotatably attached by a rotating shaft (47) of four, and the first horizontal plates (24a), (24) with respect to the housing.
b), second horizontal plates (37a), (38a), first connecting plate (29), second connecting plate (30), and first, second,
3, 4 rotation shafts (31), (34), (43), (4
The door is opened / closed by 7) and a straight line connecting the respective rotation centers of the first and third rotation shafts (31) and (43),
A door opening / closing device in which a door is rotated around an intersection of a straight line connecting the respective rotation centers of the second and fourth rotation shafts (34) and (47), wherein the first horizontal plate (24a) ) And (24b) are formed by inclined side portions (24a ') and (24b') which are inclined so that the width gradually decreases from the door side to the back side of the housing, and the second horizontal plate (24b) is formed. 37a) and (38a) in the state where the door is closed, the first horizontal plates (24a) and (24a).
The inclined side portions (37) inclined toward the housing side so as to substantially match the inclined side portions (24a ′) and (24b ′) of FIG.
a ') and (38a'), the first shaft hole (2
7) and the distance between the third shaft hole (39) and the second shaft hole (2
8) and the fourth shaft hole (40) are reduced in distance so that the first connecting plate (29) and the second connecting plate (30) are connected to the first and third shaft holes (30). 27), (39)
And the second and fourth shaft holes (28) and (40) are linearly connected to each other in a straight line, and the first connecting plate (29) is provided at both ends in the horizontal direction. Insertion holes (29a) and (29b) that are rotatably inserted into the first and third rotation shafts (31) and (43) in a close contact manner are formed by a drawing process, and the second connection is formed. Board (3
0) on both ends in the horizontal direction of the second and fourth rotating shafts (3
4) and (47) are characterized in that the insertion holes into which they are rotatably and closely fitted are formed by drawing.

<Operation> Because of this, the door opening / closing device of the present invention has the first to fourth
The door is opened and closed in the same manner as in the conventional example by the rotating shaft of, but the upper and lower first horizontal plates 24a and 24b and the upper and lower second horizontal plates 37a with respect to the direction of the force for strongly opening the door. 38
Since a is parallel, this force acts parallel to the surface direction of these horizontal plate portions. Since the first and second horizontal plates are shaped so as to substantially coincide with each other in the closed state, the first and second connecting plates 29 and 30 are composed of linear flat plates that are short in the horizontal direction. The first and second connecting plates 29, 30 are unlikely to be deformed. Further, since the shaft insertion holes at both ends of the first and second connecting plates 29, 30 are formed by drawing, the opening / closing operation can be smoothly performed without rattling.

<Embodiment of the Invention> An embodiment of the invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention.

In the figure, 20 is a housing such as a public telephone, which has a door 21 on the front side.
It has an opening 22 that is opened and closed by.

A base 23 is fixed to the side wall 20a of the housing 20, and two first horizontal plates 24 vertically parallel to each other are attached to the base 23.
a and 24b are upper and lower vertical mounting portions 24d and 24e that are bent from the first horizontal plates 24a and 24b.
In the mounting holes 25, ... Of d, 24e, screws 26 ,.
Is fixed vertically to the base 23. Reference numeral 24c is a connecting portion that connects the upper and lower first horizontal plates 24a and 24b.

The first horizontal plates (24a), (24b) are inclined side parts (24a '), (24b') that are inclined in a substantially triangular shape so that the width gradually narrows from the door 21 side to the back side of the housing 20. ) Is provided.

Circular first shaft holes 27, 27 are provided in the corners of the first horizontal plates 24a, 24b near the openings 22, and second shaft holes 28, 28 are provided on the back side of the first shaft holes 27, 27. A first connecting plate 29 is provided in the first shaft holes 27, 27 closer to the parts, a second connecting plate 30 is provided in the second shaft holes 28, 28 on the rear side, and first horizontal plates 24a, 24b. Mounted vertically and rotatably.

As shown in FIG. 5, the first connecting plate 29 is a flat plate which is straight in the horizontal direction and has circular insertion holes 29 at both ends.
a and 29b are made of a pre-formed aluminum drawing material or the like, and as shown in FIG. 6, the upper first horizontal plate 24a.
The first shaft hole 27, the insertion hole 29a of the first connecting plate 29,
The first rotating shaft 31 having a cylindrical shape is rotatably inserted into the first shaft hole 27 of the lower first horizontal plate 24b so that there is no rattling, that is, in close contact with the first horizontal plate 24b. On the upper side of 24a and the lower side of the second horizontal plate 24b, the stoppers 32, 32 are fitted into the circumferential groove 31a of the first rotating shaft 31 and are prevented from stoppering.

In the figure 33, the first connecting plate 29 is the first horizontal plate 24b.
It is a washer for smoothly rotating without directly contacting.

The second connecting plate 30 also has the same configuration, and the second rotating shaft 34 is exactly the same as the second shaft hole 2 of the upper first horizontal plate 24a.
8. The second connecting plate 30 is rotatably and closely inserted into the insertion hole on one end side and the second shaft hole 28 of the lower first horizontal plate 24b. 36 is a washer.

The other ends of the first connecting plate 29 and the second connecting plate 30 are rotatably attached to horizontal upper and lower second horizontal plates 37a and 38a.

As shown in FIG. 2, a flat plate 51 is fixed inside the door 21 on one end side. At one end of this flat plate 51, the second
As shown in the figure, a projection 51a is provided to cover the inside of the edge 22a of the opening 22 with the door 21 closed.

The flat plate 51 includes the upper and lower second horizontal plates 37a and 38a.
Vertical mounting portions 37b and 38b of the mounting holes 52, ...
Are vertically fixed by screws 53 ,.

The second horizontal plates 37a and 38a are provided on the door 2 as shown in FIG.
The first horizontal plates 24a, 24b are provided with inclined side portions 37a ', 38a' inclined toward the housing 20 so as to substantially coincide with the inclined side portions 24a ', 24b' of the first horizontal plates 24a, 24b. Circular third shaft holes 39, 39 are provided in an intermediate portion of the two horizontal plates 37a, 38a, and circular fourth shaft holes 40, 40 are provided at a rear end portion.

As shown in FIG. 6, the third of the upper second horizontal plate 37a is
Shaft hole 39, spacer 41 hole 41a, first connecting plate 2
The cylindrical third rotating shaft 43 is rotated in close contact with the insertion hole 29b of the spacer 9, the hole 42a of the spacer 42, and the third shaft hole 39 of the lower second horizontal plate 38a without rattling. The stoppers 44, 44 are movably inserted and are provided above the second horizontal plate 37a and below the second horizontal plate 38a.
It is fitted into the peripheral grooves 43a, 43a and is prevented from coming off.

Similarly, the fourth shaft hole 40 of the upper second horizontal plate 37a, the hole of the spacer 45, the insertion hole on the other end side of the second connecting plate 30, the hole of the spacer 46, and the lower second hole. Horizontal plate 38a
A fourth rotation shaft 47 having a cylindrical shape is rotatably and closely inserted into the fourth shaft hole 40 so as to be free from rattling, and similarly the upper side of the second horizontal plate 37a and the second horizontal plate 37a. On the lower side of the plate 38a, a retaining member 48 is fitted in a circumferential groove of the fourth shaft body 47 to prevent retaining.

Thus, the spacers 41, 42, 45, and 46 are vertically interposed because the upper second horizontal plate 37a is the upper first plate.
Second lower horizontal plate 3 at a position higher than the horizontal plate 24a of
8a is positioned below the lower first horizontal plate 24b so that the first horizontal plates 24a and 24b can be opened and closed during the door opening / closing operation.
This is to prevent the second horizontal plates 37a and 38a from interfering with each other.

In the figure, 49 and 50 are washers.

A contact plate 54 is fixed inside the other end of the opening 22.

In this structure, both ends of the first connecting plate 29 and the second connecting plate 30 are attached to the first horizontal plates 24a and 24b and the second horizontal plates 37 and 38, the first rotating shaft 31, and the second rotating plate 31, respectively. Rotating shaft 34 of
The third rotation shaft 43 and the fourth rotation shaft 47 are rotatably attached, and the distance between the third rotation shaft 43 and the fourth rotation shaft 47 is constant. 9 to 9, the door 21 has a straight line B connecting the center of the first rotation shaft 31 and the rotation center of the third rotation shaft 43 as shown in FIG.
Then, it rotates about an intersection 0 between a center of the second rotating shaft 34 and a straight line C connecting the center of rotation of the fourth rotating shaft 47.

Since this intersection 0 changes with the rotation of the door 21,
When the opening is started from the closed state in the figure, the protrusion 51a protruding from the inside of the edge of the door 21 is located between the opening edge 22a and the connecting portion 24c of the first plate 24 as shown by the curve D in FIG. So that the door 21 can be opened and closed to the right (in FIG. 3) and extracted without interfering with the opening edge 22a.
Positions of first and second rotary shafts 31 and 34, positions of third and fourth rotary shafts 43 and 47, first and third rotary shafts 31 and 43
The distance between them and the distance between the second and fourth rotating shafts 34 and 47 are set.

Therefore, in this door opening / closing device, the protrusion 51a is opened and closed without interfering with the opening edge 22a as shown in FIGS.
Even if a driver or the like is inserted through the gap between the opening edge 22a and the edge of the door 21 in the closed state, the protrusion 51a
Is blocked by. Note that FIG. 4 shows a state in which the door 21 is opened up to the maximum angle.

<Effects of the Present Invention> In the door opening / closing device of the present invention, (a) the first horizontal plates 24a, 24b are inclined sides in which the width is gradually narrowed from the door side to the back side of the housing. The second horizontal plates 37a and 38a, the inclined side portions 24a 'of the first horizontal plates 24a and 24b are formed by the portions 24a' and 24b '.
The second side and the side between the first shaft hole 27 and the third shaft hole 39 are composed of inclined side portions 37a 'and 38a' which are inclined toward the housing so as to substantially coincide with 24b '. By reducing the distance between 28 and the fourth shaft hole 40, the first connecting plate 29 and the second connecting plate 30 are
Between the third shaft holes 27 and 39 and the second and fourth shaft holes 2
Since it is configured by a linear flat plate that linearly connects between 8 and 40, when a strong force is accidentally opened to open the door 21 more than the maximum angle, the upper and lower first horizontal plates 24
Since a, 24b and the second upper and lower horizontal plates 37a, 38a are parallel to the direction of the force that the door 21 tries to open,
Since this force is applied in parallel with the surface direction of these horizontal plate portions, it is not only possible to withstand a strong force, but also the upper and lower second horizontal plates 37a, 38a are not supported by the first horizontal plates 24a, 24a.
The slanted side portion 3 obliquely extending in the direction of the slanted side portions 24a 'and 24b' of b (that is, in the direction in which this pulling force acts)
7a 'and 38a' are provided, and because of the shape extended long in the direction of the opening force, the conventional one is extended more vertically to the door (or housing). 56-
Since it can endure much stronger force than that of No. 93986, even if the door 21 is strongly opened, the number plate is not likely to be deformed.

(B) Further, the first horizontal plates 24a, 24b are constituted by inclined side portions 24a ', 24b' which are inclined so that the width thereof gradually becomes narrower from the door side to the housing inner side, and Two
The horizontal plates 37a, 38a of the first horizontal plate 24a, 24b in the state where the door is closed.
The inclined side portions 37a 'and 38a' are inclined toward the housing so as to substantially coincide with a'and 24b '.
Between the second shaft hole 27 and the third shaft hole 39 and the second shaft hole 2
The first connecting plate 29 and the second connecting plate 30 are connected between the first and third shaft holes 27 and 39 and the second connecting plate 30 by reducing the distance between the fourth and fourth shaft holes 40. , And the fourth shaft holes 28 and 40 are linearly connected to each other so as to form a linear flat plate, the first and second connecting plates 29 and 30 are composed of a linear flat plate having a minimum horizontal length. As a result, even if a strong force that tries to open the door excessively is applied, it can withstand, it is not deformed, and it is possible to prevent accidents such as the door not being opened and closed.

(C) First, as in the conventional Japanese Unexamined Patent Publication No. 56-93986,
Instead of connecting the end portions of the second connecting plate by curled shaft holes, the first and third rotating shafts (31), (43) are provided at both horizontal ends of the first connecting plate (29). Insertion holes (29a) and (29b) into which the and are rotatably inserted in a close contact manner are formed by a drawing process, and the second connecting plate (3)
0) on both ends in the horizontal direction of the second and fourth rotating shafts (3
Since the insertion holes 4) and (47) that are rotatably and closely attached to each other are formed by the drawing process, there is no rattling between each rotary shaft and each plate, and the dimensional accuracy between the rotary shafts is improved. It can be maintained accurately, the complicated adjustment work of the conventional device is unnecessary, and the smooth opening / closing operation can be performed.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a perspective view of a main part thereof, FIG. 2 is a state in which a door is closed, FIG. 3 is in the middle of opening, and FIG. FIG. 5 is a plan view showing a state in which the corners are opened, FIG. 5 is a perspective view showing a second plate, and FIG. 6 is a cross-sectional view showing a connection state by a first rotation shaft and a third rotation shaft. FIGS. 7 to 9 show a conventional apparatus. FIG. 7 is a perspective view showing a main part thereof, FIG. 8 is a closed state, and FIG. 9 is a plane sectional view showing a state in which a maximum angle is opened. is there. 20 ... Casing, 21 ... Door, 22 ... Opening, 22a ...
... Edge, 23 ... Base, 24a, 24b ... First horizontal plate, 24a ', 24b' ... Inclined side, 27 ... First shaft hole, 28 ... Second shaft hole , 29 ... the first connecting plate,
30 ... second connecting plate, 31 ... first rotating shaft, 34 ...
... second rotary shaft, 37a, 38a ... second horizontal plate, 3
7a ', 38a' ... inclined side portion, 39 ... third shaft hole,
40 ... Fourth shaft hole, 41 ... Spacer, 42 ... Spacer, 43 ... Third rotating shaft, 45 ... Spacer, 46
...... Spacer, 47 ...... Fourth rotation axis, 51 ...... Plate,
51a ... a protrusion.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenichi Kimura 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Koichi Yajima 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (56) Reference JP-A-56-93986 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A first fixed to an inner end portion of a housing near a door, vertically provided in parallel with each other, and provided at two positions near a door and at a back position thereof. , First horizontal plates (24a), (24b) having second axial holes (27), (28), and inner ends of the doors near the first horizontal plates (24a), (24b) Third and fourth shaft holes (39), (40), which are fixed to each other and are provided in parallel with each other at intervals in the vertical direction, and which are respectively formed at two positions on the door side and the tip portion thereof.
Second horizontal plates (37a), (38a) each having one end, and the first horizontal plates (24a), (2
4b) is rotatably attached to the first shaft holes (27) and (27) by a first rotation shaft (31) perpendicular to the first horizontal plates (24a) and (24b). And the other end
The upper and lower second horizontal plates (37a) and (38a) have third axial holes (39) and (39) which are perpendicular to the second horizontal plates (37a) and (38a). A first connecting plate (29) rotatably attached by a rotating shaft (43) of 3 and one of the upper and lower first horizontal plates (24a), (2).
4b) is rotatably attached to the second shaft holes (28) and (28) by a second rotation shaft (34) perpendicular to the first horizontal plates (24a) and (24b). And the other end
In the fourth shaft holes (40) and (40) of the upper and lower second horizontal plates (37a) and (38a), there are first vertical plates (37a) and (38a) that are perpendicular to the second horizontal plates (37a) and (38a). A second connecting plate (30) rotatably attached by a rotating shaft (47) of four, and the first horizontal plates (24a), (24) with respect to the housing.
b), second horizontal plates (37a), (38a), first connecting plate (29), second connecting plate (30), and first, second,
3, 4 rotation shafts (31), (34), (43), (4
The door is opened / closed by 7) and a straight line connecting the respective rotation centers of the first and third rotation shafts (31) and (43),
A door opening / closing device in which a door is rotated around an intersection of a straight line connecting the respective rotation centers of the second and fourth rotation shafts (34) and (47), wherein the first horizontal plate (24a) ) And (24b) are formed by inclined side portions (24a ') and (24b') which are inclined so that the width gradually decreases from the door side to the back side of the housing, and the second horizontal plate (24b) is formed. 37a) and (38a) in the state where the door is closed, the first horizontal plates (24a) and (24a).
The inclined side portions (37) inclined toward the housing side so as to substantially match the inclined side portions (24a ′) and (24b ′) of FIG.
a ') and (38a'), the first shaft hole (2
7) and the distance between the third shaft hole (39) and the second shaft hole (2
8) and the fourth shaft hole (40) are reduced in distance so that the first connecting plate (29) and the second connecting plate (30) are connected to the first and third shaft holes (30). 27), (39)
And the second and fourth shaft holes (28) and (40) are linearly connected to each other in a straight line, and the first connecting plate (29) is provided at both ends in the horizontal direction. Insertion holes (29a) and (29b) into which the first and third rotation shafts (31) and (43) are rotatably and closely inserted are formed by a drawing process, and the second connection is formed. Board (3
0) on both ends in the horizontal direction of the second and fourth rotating shafts (3
4) The door opening / closing device characterized in that the insertion hole into which (47) is rotatably inserted in close contact is formed by a drawing process.