JP7410046B2 - Push-in opening/closing device - Google Patents

Description

The present invention relates to an opening/closing device configured to open a slot by pushing in a lid.

As shown in Patent Document 1 (Japanese Patent No. 4,885,257), push-type opening/closing devices are often used in trash cans. This opening/closing device has a support frame, a lid, and a weight. The support frame is attached to the box body of the trash can and defines an input opening. The upper end of the lid is rotatably supported by the support frame around a horizontal axis of rotation, and is adapted to open and close the slot. The weight is fixed to the back side of the lid and applies a rotational moment to the lid in the closing direction. When the lid is pushed against the rotational moment of the weight, the slot is opened.

After pushing the lid in and inserting your hand into the slot to throw in the garbage, when you release your hand from the lid, the rotational moment caused by the weight causes the lid to close forcefully, causing the lid to hit the support frame and make a loud noise. Therefore, in Patent Document 1, a rotary damper is attached to a shaft member that rotatably supports the lid to reduce the force of the lid closing operation.

As trash cans become larger, push-type opening/closing devices also become larger. In that case, the rotational moment in the closing direction of the lid also increases, but the rotational damper disclosed in Patent Document 1 cannot exhibit a sufficient buffering function against the large rotational moment.

The present invention was made to solve the above problems, and includes a support frame defining an input port,
a lid whose end portion is rotatably supported by the support frame around a rotational axis, and which opens and closes the inlet; a biasing member which applies a rotational moment in the closing direction to the lid; and a biasing member that rotates the lid in the closing direction. In a push-type opening/closing device equipped with a damper mechanism that suppresses
The damper mechanism includes first and second cam members arranged on the rotation axis and a linear damper, the first and second cam members each having a cam surface that contacts each other, and the first and second cam members each have a cam surface that contacts each other. A cam member is supported non-rotatably on the support frame, the second cam member is supported non-rotatably on the lid, and as the lid rotates, one of the first and second cam members is rotated. The member moves in the axial direction, and the linear damper suppresses the axial movement of the one cam member as the lid rotates in the closing direction.

According to the above configuration, the rotation of the lid in the closing direction is converted into an axial force by the first and second cam members, and this axial force is received by the linear damper, so the rotational moment of the lid in the closing direction is large. It can provide a sufficient buffering function even in the case of

Preferably, the first cam member is fixed to the support frame so as not to be axially movable, the second cam member is configured to move in the axial direction as the lid rotates, and the damper mechanism further includes: The holder has a holder fixed to the back side of the lid, the holder has a housing cylinder portion disposed on the rotation axis, and the end closer to the first cam member is an open end; A second cam member and the linear damper are housed in the accommodating tube, the linear damper is disposed on the back side of the accommodating tube, and the second cam member is disposed on the open end side, and the linear damper is disposed on the back side of the accommodating tube. axially slidable and non-rotatable relative to the section.
According to the above configuration, since the linear damper is disposed on the lid, a sufficient stroke can be ensured without being subject to major restrictions. Further, since the linear damper is housed in the holder and the second cam member is housed so as to be slidable in the axial direction, a stable buffering function can be exhibited. Furthermore, by aligning the second cam member housed in the holder with the first cam member fixed to the support frame, the damper mechanism can be assembled efficiently.

Preferably, the holder has a mounting plate that is integral with the housing cylinder, the mounting plate has a plurality of slits extending parallel to the rotation axis, and the back side of the lid has a mounting plate that is integral with the housing tube. A plurality of threaded rods protruding from the lid are fixed, and the threaded rods are inserted into the slit at a location far from the first cam member, and by tightening a nut that is threaded onto the threaded rods, the holder is closed. is fixed to the back side of the lid.
According to the above configuration, the second cam member can be aligned with the first cam member by moving the holder parallel to the rotation axis with the threaded rod inserted through the slit of the holder, and then the nut Since the holder can be fixed to the lid, the damper mechanism can be assembled more efficiently.

Preferably, the plurality of slits include a first slit formed in a portion far from the first cam member in the mounting plate portion of the holder, and a second slit formed in a portion close to the first cam member. An end of the second slit near the first cam member is open at a side edge of the mounting plate.
According to the above configuration, since the end of the second slit is open, in the initial position before moving the holder toward the first cam member, the threaded rod is placed away from the holder and directly beside the second slit. be able to. Therefore, the locations where the threaded rod and the nut are fixed in the first and second slits can be sufficiently separated in the direction of the rotation axis, and the strength of fixing the holder to the lid can be increased.

Preferably, the holder has a pair of side plate portions that are orthogonal to the mounting plate portion and extend to both side edges of the mounting plate portion and extend to both ends of the housing cylinder portion, and of the pair of side plate portions, one side plate portion is connected to the first cam member. A passage hole is formed in the closer side plate portion, which is connected to the open end of the second slit and allows the threaded rod to pass therethrough.
According to the above configuration, the strength of the holder can be increased by the pair of side plates. Since a passage hole is formed in one side plate portion, a threaded rod located at a position away from the holder can pass through the passage hole and enter the second slit. Therefore, in the process of assembling the damper mechanism, the one side plate does not impede movement of the holder in the direction of the rotational axis.

Preferably, the support frame has a pair of support plate parts protruding from both side edges thereof to the back side, and the lid has a pair of arm parts protruding from the both side edges thereof to the back side, and the pair of arms is rotatably supported by the pair of support plate parts via a pair of shaft members, and the first cam member is integrally formed with a coaxial cylinder part, and the first cam member and the cylinder part are integrally formed. A core member is fixed through the part, the cylinder part and the core member constitute one of the pair of shaft members, one end part of the core member is fixed to the support plate part, and the other end part is fixed to the support plate part. protrudes from the first cam member and is slidably inserted into the cylindrical second cam member.
According to the above configuration, by using the core member, the first cam member can be firmly fixed, the lid can be stably and rotatably supported, and the second cam member can be stably moved in the axial direction. .

According to the present invention, even if the push-in opening/closing device becomes large in size, it can exhibit a sufficient buffering function against rotation of the lid in the closing direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a trash can equipped with a push-in opening/closing device according to an embodiment of the present invention, with the lid closed. FIG. 1B is a view corresponding to FIG. 1A showing a state in which the lid is open. 1A is a plan cross-sectional view of the switchgear taken along line II-II in FIG. 1A. FIG. It is a side sectional view of the above-mentioned opening and closing device, and shows a state where a lid is closed. FIG. 3A is a view corresponding to FIG. 3A showing a state in which the lid is open. It is a perspective view of the above-mentioned opening and closing device seen from the back side, and shows a state where a lid is closed. FIG. 4A is a view corresponding to FIG. 4A showing a state in which the lid is open. FIG. 2 is an enlarged perspective view of the main parts of the opening/closing device and a cutaway view of the accommodating cylindrical portion of the holder of the damper mechanism, with the lid closed. FIG. 5A is a view corresponding to FIG. 5A showing a state in which the lid is open. It is a perspective view showing an assembly process of the above-mentioned damper mechanism, and shows a housing cylinder part of a holder cut away. FIG. 3 is a perspective view showing the damper mechanism disassembled into each component.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, a large trash can (box) includes a box body 1 and an opening/closing device 2. A rectangular opening 1x (shown only in FIG. 2) is formed in the upper part of the front wall 1a of the box body 1, and a unitized opening/closing device 2 is attached to this opening 1x.

As shown in FIGS. 1 to 4, the opening/closing device 2 includes a support frame 10 fixed to the box body 1, a lid 20 rotatably supported by the support frame 10, and a lid 20 biased in the closing direction. The main components include a weight 30 as a biasing member and a damper mechanism 40 that suppresses the rotational moment of the weight 30 in the closing direction of the lid 20.

The support frame 10 includes a flat frame plate 11 that is rectangular when viewed from the front, and a pair of brackets 15 fixed to the back surfaces of the left and right parts of the frame plate 11. The frame plate 11 is arranged so as to cover the periphery of the opening 1x of the front wall 1a from the front, and has an input port 12. Each bracket 15 includes a first fixing plate part 16 fixed to the back surface of the frame board 11, and a right angle to the first fixing plate part 16 from one side edge (outer edge in the left-right direction) of the first fixing plate part 16. A second fixing plate part 17 that projects to the back side at a right angle to the first fixing plate part 16 from the other side edge (inside edge in the left-right direction) of the first fixing plate part 16 and a support plate part that projects to the back side at a right angle to the first fixing plate part 16. 18. The support frame 10 is fixed to the box body 1 by fixing the second fixing plate portions 17 of the pair of brackets 15 to the left and right edge surfaces of the opening 1x of the box body 1 with screws 60. The support plate portion 18 is formed with a through hole 18a through which the screw 60 is inserted.
The support plate part 18 is wide and projects toward the back of the box body 1, thereby restricting the movement of the hand of a person who has entered the slot 12.

The upper end portion of the lid 20 is rotatably supported by the left and right support plate portions 18 of the support frame 10. More specifically, an auxiliary bracket 25 is fixed to the upper back surface of the lid 20. The auxiliary bracket 25 includes an elongated base plate part 26 that extends in the left-right direction and is fixed to the back surface of the lid 20 and constitutes a part of the lid 20, and extends from both left and right ends of the base plate part 26 to the back side at right angles to the base plate part 26. It has a pair of protruding arm portions 27. The base end portions of the pair of arm portions 27 are rotatably connected to the pair of support plate portions 18 of the support frame 10 via shaft members 28 and 29, respectively. As a result, the upper end of the lid 20 is rotatably supported by the support frame 10 about the horizontal axis of rotation L (shown only in FIGS. 3 and 7) that extends left and right through the shaft members 28 and 29. ing.
As shown in FIG. 3, the lower end of the lid 20 has a bent shape, and the frame plate 11 of the support frame 10 has a receiving portion 13 that receives the lower end when the lid 20 is in the closed state. is formed.

A weight 30 made of a metal rod is spanned between the distal end portions of the pair of arm portions 27 of the auxiliary bracket 25. As a result, a rotational moment in the closing direction generated by the weight of the weight 30 is always applied to the lid 20.

The damper mechanism 40 is arranged, for example, on the left side when viewed from the back side, and as shown in FIG. , and a holder 45. The first cam member 41, the second cam member 42, and the holder 45 are made of hard resin.

A cylindrical portion 28a is integrally formed with the first cam member 41, and a metal core member 28b is fixedly penetrated through the first cam member 41 and the cylindrical portion 28a. As a result, the first cam member 41 cannot rotate or move in the axial direction relative to the core member 28b.

One end of the core member 28b has a non-circular cross section, and with this end fitted into the non-circular shaft hole of the support plate portion 18 of the support frame 10, the screw 61 (see FIG. 5) is inserted into the end surface of the core member 28b. By screwing the core member 28b and the first cam member 41 into the support plate portion 18, the core member 28b and the first cam member 41 are fixed to the support plate portion 18 so as to be unrotatable and immovable in the axial direction.

The cylindrical portion 28a is rotatably inserted into the shaft hole of the arm portion 27 of the auxiliary bracket 25. As a result, the left arm portion 27 is rotatably supported by the left support plate portion 18 when viewed from the back side. The left shaft member 28 is constituted by the cylinder portion 28a and the core member 28b. Note that the right arm portion 27 is also rotatably supported by the right support plate portion 18 by a shaft member 29.

As is clear from the above description, the first cam portion 41 is fixed to the support plate portion 18 of the support frame 10 so as to be non-rotatable and immovable in the axial direction, and is disposed inside the arm portion 27 .
As shown in FIG. 7, the other end of the core member 28b projects from the first cam member 41 toward the second cam member 42. The surface of the first cam member 41 facing the second cam member 42 has a shape that repeats peaks and valleys along the circumferential direction, and has a plurality of cam surfaces 41a inclined with respect to the rotation axis L.

The second cam member 42 has a cylindrical shape with a bottom, and the surface facing the first cam part 41 has a shape that repeats peaks and valleys along the circumferential direction, and has a plurality of cams inclined with respect to the rotation axis L. It has a surface 42a. The cam surface 41a of the first cam member 41 and the cam surface 42a of the second cam member 42 have complementary shapes.
The protruding end of the core member 28b is inserted into the second cam member 42 so as to be slidable in the axial direction, and the cam surfaces 41a, 42a of both cam members 41, 42 are in contact with each other.

The holder 45 includes a mounting plate portion 46 fixed to the back side of the upper end portion of the lid 20, more specifically, a mounting plate portion 46 fixed to the base plate portion 26 of the auxiliary bracket 25, and a mounting plate portion 46 connected to the upper edge of the mounting plate portion 46 and arranged on the rotation axis L. It integrally includes a positioned cylindrical housing tube portion 47 and a pair of side plate portions 48 that are continuous with the left and right edges of the mounting plate portion 46 and are perpendicular to the mounting plate portion 46 . The pair of side plate portions 48 also extend to both ends of the housing cylinder portion 47 . The strength of the holder 45 is increased by the pair of side plates 48.

One end of the housing cylinder portion 47 is closed, and the other end is open. The second cam member 42 and the linear damper 43 are housed in the housing cylinder portion 47 . The linear damper 43 is arranged on the closed end 47b side, and the second cam member 42 is arranged on the open end 47a side.

The linear damper 43 has a well-known structure, so it will be briefly explained, but it has a cylinder 43a, a piston (not shown) housed in the cylinder 43a, and a rod 43b having one end fixed to the piston and protruding from the cylinder 43a. The resistance of the viscous fluid contained in the cylinder 43a creates resistance to the movement of the rod 43b in the contraction direction (retreat direction). Note that no large resistance acts against the movement of the rod 43b in the extending direction. The rod 43b is biased in the extending direction by a return spring built into the cylinder 43a. The tip of the rod 43b is in contact with the bottom of the second cam member 42.

Key portions 42x are formed on the circumferential surface of the second cam member 42 at intervals in the circumferential direction. By fitting this key portion 42x into a key groove 47x formed on the inner circumferential surface of the accommodating cylindrical portion 47 of the holder 45, the second cam member 42 is made slidable in the axial direction but not rotatable, and the accommodating cylindrical portion 47 supported within.

The damper mechanism 40 having the above configuration is assembled as shown in FIG. The details will be explained below. Prior to the final assembly process, the arm portion 27 of the lid 20 is rotatably supported by the support plate portion 18 of the support frame 10 by shaft members 28 and 29. The first cam member 41 is fixed to the support plate part 18 via the shaft member 28, and the first cam member 41 and the core member 28b protrude inside the arm part 27. The linear damper 43 and the second cam member 42 are housed in the housing cylinder portion 47 of the holder 45 as described above.

A first slit 46a extending parallel to the rotation axis L is formed in a portion of the mounting plate portion 46 of the holder 45 far from the first cam member 41, and a first slit 46a extending parallel to the rotation axis L is formed in a portion close to the second cam member 41. Two second slits 46b are formed spaced apart in the vertical direction. The second slit 46b is shorter than the first slit 46a, but the end of the second slit 46b on the first cam member 41 side is open at the side edge of the mounting plate part 46, and the elongated passage formed in the side plate part 48 It is connected to the hole 48a.
Spot facings 46c are formed at the ends of the first slit 46a and the second slit 46b far from the first cam member 41, respectively.
A threaded rod 51a corresponding to the first slit 46a and a threaded rod 51b corresponding to the second slit 46b are stud-welded to the base plate 26 of the auxiliary bracket 25.

The final assembly process is performed as follows.
First, with the lid 20 in the open position with respect to the support frame 10 as shown in FIG. 6, the mounting plate part 46 of the holder 45 is brought into contact with the base plate part 26 of the auxiliary bracket 25 and positioned at the initial position. In the initial position of the holder 45, one threaded rod 51a is inserted into the first slit 46a of the holder 45 at or near the end near the first cam member 41, and the other two threaded rods 51b are inserted into the first slit 46a of the holder 45. It is arranged directly beside the passage hole 48a of the side plate 48 and away from the side plate 48.

Next, as shown by the arrow in FIG. 6, it is moved toward the first cam member 41. Then, the cam surface 41a of the first cam member 41 and the cam surface 42a of the second cam member 42 engage with each other as shown in FIG. 5B. In this process, the threaded rod 51a moves along the first slit 29a and reaches the end of the first slit 29a that is far from the first cam member 41. Further, the threaded rod 51b passes through the passage hole 48a of the side plate portion 48, passes through the second slit 29b, and reaches its end (the end farthest from the first cam member 41). In this state, by screwing the nuts 52 onto the threaded rods 51a and 51b and tightening them toward the counterbore 46c, the holder 45 is fixed to the base plate 26 of the auxiliary bracket 25 (that is, fixed to the lid 20), and the damper Assembly of mechanism 40 is completed.

As described above, the linear damper 43 is housed in the housing cylinder part 47 of the holder 45, and the second cam member 42 is housed therein, and the second cam member 42 is engaged with the first cam member 41 fixed to the support frame 10. By matching, the assembly work of the damper mechanism 40 can be performed efficiently. Moreover, by moving the holder 45 parallel to the rotation axis L, the second cam member 42 can be aligned with the first cam member 41, and then the holder 45 can be fixed with the nut 52, so that Assembling work of the damper mechanism 40 can be performed efficiently.

Further, by making the first slit 46a longer and opening the second slit 46b at the side edge of the holder 45, the movement stroke of the holder 45 in the above assembly process can be lengthened. As a result, the fixing location between the threaded rod 51a and the nut 52 and the fixing location between the threaded rod 51b and the nut 52 can be sufficiently separated in the direction of the rotation axis L, thereby increasing the strength of fixing the holder 45 to the lid 20. I can do it. Since the passage hole 48a for passing the threaded rod 51b is formed in the side plate part 48, the side plate part 48 does not hinder the movement of the holder 45.

The operation of the opening/closing device 2 having the above configuration will be explained. Normally, the lid 20 is brought into contact with the support frame 10 due to the rotational moment of the weight 30, thereby closing the inlet 12 (see FIGS. 1A, 3A, and 4A). At this time, as shown in FIG. 5A, the first cam member 41 and the second cam member 42 are farthest apart, and only a portion of the cam surfaces 41a and 42a are in contact with each other. Rod 43b is in the retracted position.

When a user throws garbage into a trash can, he or she opens the inlet 12 by pushing the lid 20 with his/her hand against the rotational moment in the closing direction (see FIGS. 1B, 3B, and 4B), and inserts the garbage into the inlet 12. Dust is dropped into the box body 1 from the inserted hand. As the lid 20 opens, the second cam member 42 rotates relative to the first cam member 41, and the rod 43b extends due to the cam action of the cam surfaces 41a, 42a and the force of the return spring of the linear damper 43. As the rod 43b pushes the second cam member 42 toward the first cam member 41, the second cam member 42 approaches the first cam member 41 and is fully engaged in the fully open state, as shown in FIG. 5B.

After that, when the user removes his hand from the input port 12, the lid 20 moves in the closing direction due to the rotational moment of the weight 30. At this time, when the lid 20 is closed forcefully, the lid 20 strongly hits the support frame 10 and generates a loud noise, but by reducing the force with the damper mechanism 40, generation of the loud noise can be prevented. Specifically, as the lid 20 rotates in the closing direction, the second cam member 42 rotates relative to the first cam member 41, and the second cam member 42 rotates relative to the first cam member 41 due to the cam action of the cam surfaces 41a and 42a. It moves in the direction away from the member 41, and the rod 43b of the linear damper 43 is pushed by the second cam member 42 and retreats. In this process, the movement of the rod 43b and the second cam member 42 is suppressed due to the resistance of the viscous fluid, and as a result, the rotational momentum of the lid 20 in the closing direction is reduced.

As described above, the rotation of the lid 20 in the closing direction is converted into an axial force by the first and second cam members 41 and 42, and this axial force is received by the linear damper 43, so that the rotation of the lid 20 in the closing direction Even when the rotational moment of is large, sufficient buffering function can be exhibited.
The second cam member 42 is accommodated in the accommodating cylinder portion 47 of the holder 45 so as to be non-rotatable and slidable in the axial direction, and is also supported by the core member 28b so as to be slidable in the axial direction, so that it can stably move in the axial direction. Therefore, it is possible to exhibit a stable buffering function.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the rotation axis may be vertical and the lid may be configured to open laterally.
A spring may be used instead of the weight as the biasing member that applies a rotational moment in the closing direction to the lid.
When adopting a structure in which the upper end of the lid is rotatably supported around a horizontal axis of rotation, the lid may be made heavy to obtain rotational moment in the closing direction due to the gravity of the lid. In this configuration, the lid itself plays the role of the biasing member.
The storage box is not limited to a trash can, but may also be a delivery box, a box for returning DVDs, books, etc.
The support frame may be integral with the box body.

The present invention can be applied to a push-in opening/closing device attached to a trash can or the like.

Claims (6)

a support frame (10) defining an input port (12);
a lid (20) whose end portion is rotatably supported by the support frame around the rotation axis (L), and which opens and closes the input port;
a biasing member (30) that applies a rotational moment in the closing direction to the lid;
a damper mechanism (40) that suppresses rotation of the lid in the closing direction;
In push-type opening/closing devices equipped with
The damper mechanism (40) includes first and second cam members (41, 42) arranged on the rotation axis (L) and a linear damper (43), and the first and second cam members and The linear damper is composed of mutually independent parts, and the first and second cam members each have cam surfaces (41a, 42a) facing each other in the direction of the rotation axis and contacting each other ,
The first cam member (41) is relatively unrotatably supported by the support frame (10), the second cam member (42) is relatively unrotatably supported by the lid (20), and the first cam member and one of the second cam members is movable in the direction of the rotation axis, and the other cam member is immovable in the direction of the rotation axis,
The linear damper (43) is supported by the support frame (10) or the lid (20) on which the one cam member is supported, is coaxial with the rotation axis (L), and is arranged in the one cam member. A push-in type opening/closing device, characterized in that the one cam member is disposed on the opposite side of the cam surface and suppresses axial movement of the one cam member as the lid rotates in the closing direction. The first cam member (41) is fixed to the support frame (10) in a non-rotatable and axially non-movable manner ,
The damper mechanism (40) further has a holder (45) fixed to the back side of the lid (20), the holder has a housing cylinder part (47) arranged on the rotation axis, The end closer to the first cam member (41) is an open end (47a),
The second cam member (42) and the linear damper (43) are housed in the accommodating cylinder part (47), the linear damper is arranged on the back side of the accommodating cylinder part, and the second cam member is located at the open end. The push-in opening/closing device according to claim 1, wherein the push-in opening/closing device is disposed on the (47a) side and is slidable in the axial direction with respect to the housing cylinder portion but is not rotatable. a support frame (10) defining an input port (12);
a lid (20) whose end portion is rotatably supported by the support frame around the rotation axis (L), and which opens and closes the input port;
a biasing member (30) that applies a rotational moment in the closing direction to the lid;
a damper mechanism (40) that suppresses rotation of the lid in the closing direction;
In push-type opening/closing devices equipped with
The damper mechanism (40) includes first and second cam members (41, 42) arranged on the rotation axis (L) and a linear damper (43), and the first and second cam members They each have cam surfaces (41a, 42a) that touch each other,
The first cam member (41) is supported by the support frame (10) in a relatively unrotatable manner, the second cam member (42) is supported by the lid (20) in a relatively unrotatable manner, and the lid is rotated. Accordingly, one of the first and second cam members (41, 42) moves in the axial direction, and the linear damper (43) moves the one of the cam members as the lid rotates in the closing direction. arranged to suppress axial movement,
The first cam member (41) is fixed to the support frame (10) so as not to be able to move in the axial direction, and the second cam member (10) moves in the axial direction as the lid (20) rotates. and
The damper mechanism (40) further has a holder (45) fixed to the back side of the lid (20), the holder has a housing cylinder part (47) arranged on the rotation axis, The end closer to the first cam member (41) is an open end (47a),
The second cam member (42) and the linear damper (43) are housed in the accommodating cylinder part (47), the linear damper is arranged on the back side of the accommodating cylinder part, and the second cam member is located at the open end. (47a) side, and is axially slidable and non-rotatable with respect to the housing cylinder portion,
The holder (45) has a mounting plate part (46) that is integral with the housing cylinder part (47), and the mounting plate part has a plurality of slits (46a, 46b) is formed, and a plurality of threaded rods (51a, 51b) protruding from the lid are fixed to the back side of the lid (20), and the threaded rods are far from the first cam member in the slit. The push-in opening/closing device is characterized in that the holder is fixed to the back side of the lid by tightening a nut (52) that is inserted into the threaded rod and is threaded onto the threaded rod. The plurality of slits include a first slit (46a) formed in a portion of the mounting plate portion (46) of the holder (45) far from the first cam member (41), and a first slit (46a) formed in a portion of the mounting plate portion (46) of the holder (45) that is close to the first cam member. According to claim 3, the mounting plate includes a second slit (46b) formed in the mounting plate portion, and an end of the second slit near the first cam member is open at a side edge of the mounting plate portion. Push-type opening/closing device. The holder (45) has a pair of side plate portions (48) that are perpendicular to the mounting plate portion (46) and extend to both side edges thereof and extend to both ends of the housing cylinder portion;
Of the pair of side plate parts, the side plate part (48) that is closer to the first cam member (41) has a passage that extends to the open end of the second slit (46b) and allows the threaded rod to pass therethrough. The push-in opening/closing device according to claim 4, characterized in that a hole (48a) is formed. The support frame (10) has a pair of support plate parts (18) that protrude to the back side from both side edges thereof, and the lid (20) has a pair of arm parts (27) that protrude to the back side from both side edges thereof. The pair of arm portions are rotatably supported by the pair of support plate portions via a pair of shaft members (28, 29),
A cylindrical portion (28a) coaxial with the rotational axis (L) is integrally formed in the first cam member (41), and a core member (28b) is fixed and penetrates through the first cam member and the cylindrical portion. and one (28) of the pair of shaft members is configured by the cylinder portion and the core member,
One end of the core member (28b) is fixed to the support plate (18), and the other end protrudes from the first cam member (41) and connects to the second cam member (42) having a cylindrical shape. The push-in opening/closing device according to claim 2 , wherein the push-in opening/closing device is slidably inserted.

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