JP2011099219A - Opening support mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening support mechanism formed of less number of parts, having superior aesthetic appearance, and capable of eliminating a differential pressure. <P>SOLUTION: This opening support mechanism includes an interlocking mechanism for holding the advanced state of a latch 33 which is freely advanced and retreated from the end 13c of a door 13 and canceling the held state. In the opening support mechanism, when the handle of the door 13 is pushed or pulled in the opening direction of the door 13, the latch 33 is retreated or allowed to retreat through the interlocking mechanism 35, and simultaneously the door 13 is opened. The opening support mechanism further includes a projecting rod 37 allowed to project from the end 13c of the door 13, a cam plate 31 which cancels the holding of the advanced state of the latch 33 by the interlocking mechanism 35 and projects the projecting rod 37 by rotating in one direction following the pushing/pulling operation of the handle, and a contact part which is disposed on a building side frame, brought into contact with the projecting rod 37 when the projecting rod projects, and upon the projection of the projecting rod 37, swings the door 13 in the opening direction of the door 13 generally crossing the projecting direction of the projecting rod 37. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an opening assist mechanism that is provided, for example, at an entrance of a higher floor such as a condominium or an entrance / exit of an airtight room and solves a problem of opening / closing operation due to a pressure difference generated inside and outside the room.

  In residential buildings such as condominiums, in recent years, the air pressure inside the room has decreased due to the operation of a ventilation fan in the room. A large amount of force may be required when opening. In such a case, it is difficult for an elderly person or a child to open the door.

  Conventionally, various mechanisms have been devised to solve the above problems. For example, in Patent Document 1 and Patent Document 2 shown below, a lever that protrudes from the back surface of the handle, a peg that protrudes from the handle shaft, and the like are provided. If it is difficult to open the door due to the pressure difference between the inside and outside of the room, hold the lever with the handle and move the door itself in the opening direction by touching the protruding hook against the abutment on the building side. Is brought into contact with the inclined surface of the building-side reaction force member, and a reaction force is generated from the reaction force member on the pry bar to move the door itself in the opening direction. As a result, the door and the building-side frame can be peeled open to create a gap between the door and the building-side frame, thereby eliminating the pressure difference between the inside and outside of the room.

Japanese Patent No. 4034216 JP 2005-127044 A

  However, the mechanism in which the lever is provided separately from the handle has a large number of parts and the appearance of the lever is not good, and the operability is not good because the lever needs to be operated to open the door. In addition, the mechanism for projecting the pry bar from the handle shaft is not suitable for the appearance because the projecting bar or reaction force member is exposed, and it is caught by these parts when a person passes or a finger or the like is placed between the two members during operation. There was also a risk of pinching.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and an object thereof is to provide an opening assist mechanism capable of eliminating the pressure difference between the inside and outside of the door with a small number of parts and facilitating the door opening operation. There is to do.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The opening assisting mechanism according to claim 1 of the present invention includes a latch 33 that can be moved forward and backward from the mouth 13c of the door 13, and includes an interlocking mechanism 35 that holds the latch 33 in the advanced state and releases the held state. By pushing or pulling the handle 11 provided so as to be movable in the contact / separation direction with respect to the front and back surfaces of the door 13 in the opening direction of the door 13, the latch 33 is retracted or retracted via the interlocking mechanism 35. In the opening assist mechanism in which the backward movement is allowed and the door 13 is opened at the same time,
A projecting rod 37 that can project from the mouth 13c of the door 13;
A cam plate 31 that rotates in one direction following the push-pull operation of the handle 11 to release the holding state of the latch 33 by the interlocking mechanism 35 and to project the projecting rod 37;
The door 13 is disposed on the building-side frame 75 facing the wooden mouth 13c of the door 13 when the door 13 is closed. The door 13 abuts when the protruding rod 37 protrudes and is substantially orthogonal to the protruding direction of the protruding rod 37. A contact portion 73 that swings the door 13 together with the protrusion of the protrusion 37 in the opening direction of the door 13;
It is characterized by comprising.

  In this opening assist mechanism, when the handle 11 is pushed or pulled in the opening direction of the door 13, the cam plate 31 is driven and rotated in one direction to release the latch 33 from being held in the advanced state by the interlocking mechanism 35 and the protruding hook. 37 is projected. The projecting rod 37 is brought into contact with a contact portion 73 provided on the building-side frame body 75, and the movement of the door 13 in the opening direction caused by mutual contact between the door edge and the building-side edge. A gap can be created between them to eliminate the pressure difference between the inside and outside of the room.

The opening assist mechanism according to claim 2 is the opening assist mechanism according to claim 1,
The cam plate 31 is rotatably supported by a support shaft 39 in a direction along the door thickness direction, and a pair of arm portions 43 and 43 projecting outward in the radial direction with the support shaft 39 interposed therebetween are provided. The arm portions 43, 43 are in contact with the respective operating pieces 23 from the pair of grips 11, 11 on a surface 45 opposite to the rotation side when the door is opened, and one arm portion 43 has the protruding flange 37. It is characterized by projecting in contact with the rotating side when the door is opened.

  In this opening assist mechanism, when one of the handles 11 on the front and back surfaces of the door is pushed or pulled in the opening direction of the door 13, the operating piece 23 of the handle 11 is the surface on the opposite side to the rotating side when the door 43 is opened. 45 is pressed, and the cam plate 31 is rotated in one direction. As the cam plate 31 rotates in one direction, the cam plate 31 allows the latch 33 to retreat via the interlocking mechanism 35 and causes the protruding rod 37 to protrude.

The opening assist mechanism according to claim 3 is the opening assist mechanism according to claim 1 or 2,
The latch is an inverting latch 33.

  In this opening assist mechanism, the latch becomes the reversing latch 33 that rotates around the latch shaft 49 in the direction along the top and bottom of the door 13 as well as the forward and backward movement from the normal wooden mouth 13c. In a normal latch, the stop surface parallel to the advancing / retreating direction is not detached from the locking hole 53 of the strike plate 51 unless the latch is retracted, but in the reverse latch 33, the latch rotates around the latch shaft 49. The release from the locking hole 53 is possible.

The opening assist mechanism according to claim 4 is the opening assist mechanism according to any one of claims 1, 2, and 3,
The interlock mechanism 35 has at least one swinging member 61 that is swingably supported by a swinging shaft 63 in the same direction as the support shaft 39.
The rocking member 61 is provided at the other rocking end 61b sandwiching the rocking shaft 63 by pressing one rocking end 61a sandwiching the rocking shaft 63 by the rotation of the cam plate 31 when the door is opened. Further, the restricting portion 65 is released from the latch 33 and releases the hold of the advanced state of the latch 33.

  In this opening assist mechanism, when the cam plate 31 is rotated in one direction, one swinging end 61a of the swinging member 61 is pressed against the cam plate 31 and provided on the other swinging end 61b of the swinging member 61. The regulated portion 65 is released from the latch 33. The latch 33 can be retracted when the restricting portion 65 is disengaged.

  According to the opening assist mechanism according to claim 1 of the present invention, it is not necessary to provide a lever separately from the handle for opening and closing operations, or to protrude the pry bar from the handle shaft, and with a small number of parts, The pressure difference between the inside and outside of the door can be eliminated with good appearance. That is, the door opening operation can be easily performed only by an opening / closing operation with a normal handle.

  According to the opening assist mechanism according to claim 2, the driving of the interlocking mechanism by each handle and the driving of the protruding hook can be performed using one cam plate, that is, without increasing the number of parts, Opening assistance is provided.

  According to the opening assist mechanism of the third aspect, it is not necessary to secure a large conversion space for converting the rotation of the cam plate into the latch backward movement.

  According to the opening assist mechanism of the fourth aspect, the rotation of the cam plate can be converted into the releasing operation of the latch holding state with a small number of parts.

It is a principal part front view of the door provided with the opening assistance mechanism which concerns on this invention. (A) is principal part sectional drawing of a building side frame, (b) is the front view, (c) is AA sectional drawing. It is a plane sectional view of a door. (A) is the front view of a closed state, (b) is the BB sectional drawing represented with the contact part. (A) is a front view at the time of an operation | movement start, (b) is the CC sectional drawing. (A) is a front view at the time of completion | finish of operation | movement, (b) is the DD sectional drawing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of an essential part of a door provided with an opening assist mechanism according to the present invention, FIG. 2 (a) is a sectional view of an essential part of a building side frame, (b) is a front view thereof, and (c) is an A- A sectional view and FIG. 3 are flat sectional views of a door.
In the opening assist mechanism according to the present embodiment, a lever handle 11 (see FIG. 3) as a handle is disposed on the outdoor surface and the indoor surface with the lateral direction as a longitudinal direction, and these lever handles 11 are disposed in the outdoor direction. It is held and attached to seats 15 and 17 attached to the front and back surfaces of the door 13 that swings and opens. The lever handle 11 for the seats 15 and 17 is movable in a direction in which the lever handle 11 is close to the door surface 13a on the indoor side I, and is movable in a direction in which the lever handle 11 is separated from the door surface 13b on the outdoor side O. It constitutes a so-called push-pull lock. A lever handle shaft 19 is provided in each of the seat portions 15 and 17 to support the lever handle 11 so as to be rotatable in the direction of movement toward or away from the door surfaces 13a and 13b which are the directions of movement.

  The lever handle 11 is supported by the lever handle shaft 19 via the bracket 21. The bracket 21 protrudes into a lock box 25 provided in the door 13 with the lever handle 11 on the opposite side of the lever handle 11 serving as an operating piece 23. Further, a spring 27 is extrapolated to the lever handle shaft 19, and the spring 27 urges the lever handle 11 to the position before the operation by locking the operating end to the guide pin 29 of the bracket 21. The lever handle 11 on the pushing side is inclined in a direction in which the reference position is away from the door surface 13a, and swings to a position parallel to the door surface 13a during operation. Further, the lever handle 11 on the pulling side has a reference position parallel to the door surface 13b and swings to a position inclined in a direction away from the door surface 13b during operation.

  As shown in FIG. 1, a cam plate 31, a latch 33, an interlocking mechanism 35, and a protruding hook 37 are disposed in the lock box 25. The cam plate 31 is rotated in one direction (clockwise in FIG. 1) following the pushing and pulling operation of the lever handle 11 to release the latch 33 from being held in the advanced state and cause the protruding rod 37 to protrude. In the cam plate 31, the rotation in one direction is the rotation direction when the door is opened.

  The cam plate 31 is rotatably supported by a support shaft 39 in a direction along the door thickness direction, and is urged counterclockwise by a rotation urging spring 41. The cam plate 31 is provided with a pair of arm portions 43 and 43 projecting radially outward across the support shaft 39. The arm pieces 43, 43 abut on the surface 45 opposite to the rotation side when the door is opened, and the operating pieces 23, 23 from the pair of lever handles 11 contact each other. One arm portion (lower arm portion in FIG. 1) 43 causes the protruding rod 37 to abut on the surface 47 on the rotation side when the door is opened and protrude. Further, the arm portion 43 abuts the surface 45 opposite to the rotation side at the time of opening the door to the stopper 48 to restrict the counterclockwise rotation of the cam plate 31 within a predetermined range.

  In the present embodiment, the latch 33 is an inverting latch (hereinafter, the latch 33 is referred to as an “inverting latch 33”). That is, when the door is closed, it is retracted into the lock box 25 when the strike plate 51 is in contact, as in the case of a general latch lock. The reversing latch 33 is rotated not only in the forward and backward movement from the normal wooden mouth 13c but also around the latch shaft 49 in the direction along the top and bottom of the door 13. In a normal latch, the stop surface parallel to the advancing / retreating direction is not detached from the locking hole 53 of the strike plate 51 shown in FIG. 2 unless the latch is retracted, but the reversing latch 33 rotates around the latch shaft 49. As a result, detachment from the locking hole 53 is possible. The inversion latch 33 includes a latch body 55 and a guide portion 57.

  The latch body 55 has a substantially triangular tip formed by a stop surface and a guide surface (not shown) formed obliquely with respect to the stop surface at a predetermined angle. Is protruding. Then, both latch shafts 49 are hooked from the back surface of the front plate 59 of the lock box 25 to the peripheral edge thereof, and the front end protrudes from the front plate 59.

  The latch body 55 is provided with a biasing member (not shown) such as a compression coil spring on the rear end side, and is biased so that the front end always protrudes from the front plate 59. In a normal state, the latch body 55 protrudes from the front plate 59, the stop surface is parallel to the door surface 13a, and engages with the locking hole 53 of the counterpart strike plate 51. That is, the opening of the door 13 is restricted. Further, when the door is closed, the guide surface comes into contact with the end edge of the strike plate 51, so that the guide portion 57 recedes straight from the front plate 59 against the urging force of the urging member. Further, when the door is opened, the restriction to the latch body 55 is released by the interlock mechanism 35 described later, and the latch body 55 comes into contact with the edge of the locking hole 53 of the strike plate 51 to swing the latch shaft 49. As a moving center, a reversing operation is possible in the guide portion 57, and the latch body 55 is allowed to move backward, thereby retracting from the front plate 59 and opening the door 13.

  In the present embodiment, the latch is the inversion latch 33, so that it is not necessary to secure a large conversion space for converting the rotation of the cam plate 31 into the latch backward movement.

  The interlocking mechanism 35 is interposed between the inversion latch 33 and the cam plate 31. In this embodiment, the interlocking mechanism 35 is configured by combining a plurality of swinging members 61 and 61 each formed in a substantially L shape, and is disposed on the rear end side of the inversion latch 33. Each swing member 61, 61 is disposed in the lock box 25 so as to be swingable by a swing shaft 63, respectively. The interlocking mechanism 35 may include at least one swinging member 61 (the lower swinging member 61 in FIG. 1). The lower swinging member 61 rotates counterclockwise in FIG. 1, with one swinging end 61a sandwiching the swinging shaft 63 pressed by the cam flat surface 31a by the rotation of the cam plate 31 when the door is opened. Thus, when the restricting portion 65 provided on the other swinging end 61b sandwiching the swinging shaft 63 is engaged with the latch body 55, the latch body guides the straight forward and backward movement of the latch body. The holding | maintenance of 33 rocking | fluctuation control states is cancelled | released.

  In the present embodiment, a pair of swing members 61, 61 are provided, and the release swing (counterclockwise swing) of the lower swing member 61 in FIG. It is transmitted as a release swing (clockwise swing) of the moving member 61. The upper swinging member 61 is biased counterclockwise by the spring 69. This urging force is transmitted by the engaging portion 67 as a clockwise urging force of the lower swinging member 61.

  When the cam plate 31 is rotated in one direction (clockwise direction in FIG. 1), one swinging end 61a of the lower swinging member 61 is pressed against the cam flat surface 31a, and both swinging members 61, The restricting portions 65, 65 provided on 61 are detached from the latch body 55. As a result, the reversing latch 33 and the restricting portions 65 and 65 are detached, so that swinging and retreating are possible. Thus, in the opening assist mechanism, the rotation of the cam plate 31 can be converted into the releasing operation of the holding state of the reversing latch 33 with a small number of parts.

  The protrusion 37 is slidable by a guide shaft 68 in the lock box 25, and a tip 37 a is disposed so as to be able to advance and retract from the front plate 59. The projecting rod 37 is formed in a substantially prismatic shape and is arranged with its longitudinal direction along the door surfaces 13a and 13b, and the tip portion projects normally from the front plate 59 by a biasing member 71 made of a compression coil spring or the like. The state is not maintained. In the present embodiment, the tip 37a of the protruding rod 37 has a side surface on the closing direction side of the door 13 as a predetermined angle, and in this embodiment, an inclined surface 37b (see FIG. 3) of about 45 °, and has a substantially wedge shape. Is formed. Further, as shown in FIG. 1, the base end of the protruding rod 37 is pressed against the rotation-side surface 47 of the lower arm portion 43 when the door is opened.

  The abutting portion 73 shown in FIG. 2 is disposed below the strike plate 51 in the building-side frame 75. In the present embodiment, the contact portion 73 is substantially constituted by a support bracket 77 and a roller 79. The support bracket 77 is fixed to a recess 81 formed in the frame body 75, and is configured to extend toward the bottom 13 c of the door 13 with respect to the bottom surface of the recess 81. The roller 79 is provided at the tip of the support bracket 77, and the shaft 83 is arranged in a vertical direction along the wood mouth 13c of the door 13 so as to be rotatable.

  The recess 81 to which the support bracket 77 is fixed is configured to have a shape deeper than the plate surface of the strike plate 51 and spaced from the mouth 13c of the door 13, and the opening direction side of the door 13 is open. The building-side frame body 75 is formed like a step toward the outdoor side O. Note that the extension position of the support bracket 77 is not on the center line of the protruding rod 37 in the closed wooden mouth 13c, but is a slightly eccentric position close to the tip of the protruding rod 37. The protruding rod 37 comes into contact with the roller 79 at the tip of the support bracket by performing the protruding operation, and the protruding rod 37 protrudes from the roller 79 by the rotation of the roller 79 and the inclined surface 37b of the protruding rod tip 37a. The 37 side is moved in a direction substantially orthogonal to the advancing direction.

Next, the operation of the opening assist mechanism configured as described above will be described.
4A is a front view of the door closed state, FIG. 4B is a sectional view taken along the line B-B together with the contact portion, FIG. 5A is a front view at the start of operation, and FIG. FIG. 6A is a sectional view, FIG. 6A is a front view when the operation is completed, and FIG. 6B is a DD sectional view thereof.
The door 13 is closed by the reversing latch 33 engaging with the engaging hole 53 of the strike plate 51. When the door is closed, the door 13 is brought into close contact with a packing (not shown) which is an airtight member provided between the frame 75 and the door.

  When the door shown in FIG. 4 is closed, the lever handle 11 on either the front or back side of the door is pushed in the opening direction of the door 13 in a state where a difference in atmospheric pressure occurs between the room and the outside, making it difficult to open the door 13. When pulled, the operating piece 23 of the lever handle 11 presses the surface 45 of the arm portion 43 on the side opposite to the rotating side when the door is opened.

  In the present embodiment, for example, the lever handle 11 on the indoor side I side (upper side in FIG. 3) is pushed, and the lower operating piece 23 in FIG. 5 moves to the left in FIG. Then, the cam plate 31 is rotated in one direction (clockwise in FIG. 5). When the cam plate 31 rotates in one direction by a predetermined angle (0.2 °), the rotation-side surface 47 of the lower arm portion 43 comes into contact with the rear end surface of the protruding rod 37. At the same time, the restricting portion 65 starts swinging by the interlocking mechanism 35, retreats from the latch body 55, and the restriction state for the latch body 55 is released. That is, when there is no atmospheric pressure difference between the room and the room, the door can be opened in this state. From this, when there is no pressure difference, the initial operation to the lever handle 11, that is, the lever handle 11 can be guided to open with a shallow inclination, and when there is a pressure difference, it feels heavy. The operation of applying a force to the lever handle 11 in the opening direction as an operation force to the lever handle 11, that is, an operation of pushing or pulling the lever handle 11 is further continued.

  When the lever handle 11 is further pushed and the protrusion rod 37 starts to advance in conjunction with the swinging of the lever handle 11, the tip 37 a comes into contact with the roller 79 of the contact portion 73. The protruding rod 37 advances until the cam plate 31 is rotated by a predetermined angle (23.3 °) to be restricted in rotation. As shown in FIG. 6, the cam plate 31 is restricted from rotating clockwise when the lower arm portion 43 comes into contact with the outer periphery of the swing shaft 63. By this advancement, the inclined surface 37b at the tip of the protruding rod 37 contacts the roller 79 of the contact portion 73, and the rotation of the roller 79 moves the inclined surface 37b in the opening direction of the door 13, that is, moves the door 13 itself in the opening direction. .

  According to such a configuration of the inclined surface 37b at the tip of the protruding rod 37 and the roller 79 of the contact portion 73, the contact between each other becomes a line contact, and the roller 79 rotates so that the protruding rod 37 The advance movement can be assisted, and the movement of the door 13 in the opening direction becomes smooth.

  Thereby, it becomes possible to pry between the edge of the indoor side surface 13a of the door 13 and the building-side frame 75, and from this, a few mm to 10 mm between the edge of the door 13 and the frame 75. A gap of several mm is generated, and the atmospheric pressure difference between the inside and outside of the room is eliminated. In the present embodiment, the protruding rod 37 advances about 17 mm, and the inclined surface 37b of the protruding rod 37 and the roller 79 of the contact portion 73 move the door 13 about 12 mm in the opening direction, and only the swing operation of the lever handle 11 is performed. It is possible to start opening the door 13 by an operation that does not require such a large force.

  At the same time, the swinging operation of the lever handle 11 causes the restricting portions 65, 65 to be disengaged in the lock box 23 via the interlocking mechanism 35, and the restricting state for the reversing latch 33 is released. Thereafter, when the lever handle 11 is pulled from the outdoor side O and pushed from the indoor side I, the reverse latch 33 is reversed and retracted, and the door 13 is opened. Since the opening at this time is after the pressure difference is eliminated, the opening operation can be performed with a small force.

  In other words, since the swing of the lever handle 11 is transmitted to the interlocking mechanism 35, the operation from the swing of the lever handle 11 to the opening of the door 13 can be performed smoothly. The door opening operation can be facilitated without being aware of having an operation for canceling.

  Therefore, in the opening assist mechanism configured as described above, when a door 13 such as an entrance door in a high-rise house such as a condominium has a pressure difference between the room and the outside, it is difficult to open the door 13. By swinging the lever handle 11 disposed on the surfaces 13a and 13b, the cam plate 31 is driven and rotated in one direction to release the holding and regulation of the inversion state of the reversing latch 33 by the interlocking mechanism 35, and The protrusion 37 is protruded. The projecting rod 37 is brought into contact with a contact portion 73 provided on the building-side frame body 75, and the movement of the door 13 in the opening direction caused by mutual contact between the door edge and the building-side edge. Create a gap between them to eliminate the pressure difference inside and outside the room. Thereby, the door 13 can be opened with a small force because the difficulty in opening due to the pressure difference is eliminated.

  In the above-described embodiment, the example in which the slope 37b is provided at the tip of the protruding rod 37 and the contact portion 73 including the roller 79 is provided on the building frame 75 has been described. The contact portion 73 may have other configurations, for example, a rotatable roller may be provided at the tip of the protruding rod 37, and a slope may be provided on the building frame 75. In this case, as the tip of the protruding rod 37 advances, the roller rolls along the slope, and thus the door 13 can be moved in the opening direction. This can be resolved when there is a pressure difference.

  In the above-described embodiment, the case where the handle is the lever handle 11 has been described as an example. However, in addition to the handle, grips formed in a substantially bowl shape are vertically formed on the outdoor surface and the indoor surface of the door 13. The push-pull lock | rock arrange | positioned by making a direction into a longitudinal direction may be sufficient.

  Therefore, according to the opening assist mechanism according to the present embodiment, there is no need to provide a separate lever or to protrude the pry bar from the handle shaft, and the differential pressure can be eliminated with a small number of parts.

11 ... Handle (lever handle)
13 ... Door 13a, 13b ... Front and back surfaces of door 13c ... Kiguchi 23 ... Actuating piece 31 ... Cam plate 33 ... Latch (reverse latch)
35 ... interlocking mechanism 37 ... projecting rod 39 ... support shaft 43 ... arm portion 45 ... surface on the opposite side to the rotating side when the door is opened 47 ... surface on the rotating side when the door is opened 61 ... swing member 61a ... one swing end 61b ... the other oscillating end 63 ... the oscillating shaft 65 ... the restricting portion 73 ... the contacting portion 75 ... the building side frame

Claims (4)

It has a latch that can be moved forward and backward from the mouth of the door, and has an interlocking mechanism that holds the latch in the advanced state and releases the held state, and is provided so as to be movable toward and away from the front and back surfaces of the door. In the opening assist mechanism in which the handle is pushed or pulled in the opening direction of the door, and the latch is allowed to move backward or backward through the interlocking mechanism and the door is opened at the same time.
A projecting ridge that can project freely from the mouth of the door;
A cam plate that follows the push-pull operation of the handle and rotates in one direction to release the holding state of the latch by the interlocking mechanism and to project the protruding hook;
In the opening direction of the door, which is disposed on the building-side frame opposite to the door end of the door when the door is closed, abuts when the protruding rod protrudes, and substantially perpendicular to the protruding direction of the protruding rod, A contact portion for swinging the door together with the protrusion of the protrusion;
An opening assist mechanism characterized by comprising: The opening assist mechanism according to claim 1,
The cam plate is rotatably supported on a support shaft in a direction along the door thickness direction, and has a pair of arm portions projecting radially outward across the support shaft. Each of the operating pieces from the pair of grips abuts on the surface opposite to the door rotation side, and one of the arm portions projects the projecting rod against the rotation side when the door is opened. Opening assistance mechanism. The opening assist mechanism according to claim 1 or 2,
An opening assist mechanism, wherein the latch is an inverting latch. An opening assist mechanism according to any one of claims 1, 2, and 3,
The interlocking mechanism has at least one swinging member that is swingably supported by a swinging shaft in the same direction as the support shaft.
The swing member is pressed by one swing end sandwiching the swing shaft by rotation of the cam plate when the door is opened, and a restricting portion provided at the other swing end sandwiching the swing shaft is latched. An opening assisting mechanism, wherein the latch is released from the release state to release the holding state of the latch.

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