JP2008291483A - Door opening supporting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an entrance door opening supporting device for easily opening an entrance door when the entrance door is very heavy to open due to, for instance, the barometric difference between the indoors and the outdoors. <P>SOLUTION: This opening supporting device is so attached to an entrance upper frame as to face the entrance door. A drive motor 8, a male screw shaft 13 joined to the rotating shaft 8a of the drive motor 8 through a power transmission mechanism, two plates 17, 18 slidable in the longitudinal direction of the male screw shaft 13, and a tension spring 16 for cushioning interposed between the two plates 17, 18 and having both ends joined to the two plates 17, 18 are installed in a casing 7. The two plates 17, 18 and the tension spring 16 are integrally moved by rotating the male screw shaft 13. A door pressing device 21 attached to a connection bar 20 fixed to one plate 18 projects to the entrance door 1 side through the opening 22 of the casing 7 for pushing and opening the entrance door 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a door opening assist device for assisting opening of a door of a building such as an apartment house such as a condominium or a detached house.

As a conventional opening assisting device for this kind of door, for example, as disclosed in Patent Document 1, it is pivotably attached to a column frame via a hinge and provided with a latch that holds a closed posture. An elastic projecting bar that constantly biases the door in the open direction at any one of the hinge-side end face of the door and the side face of the column frame adjacent to the end face in the closed position of the door. The ones that are buried in and out are known.
JP 11-280329 A

  In the door opening assist mechanism disclosed in Patent Document 1 above, when the latch is released with the handle and the door is opened, the protruding force of the elastic protruding bar is applied to the hinge side end surface of the door, and the door is opened halfway. However, it is necessary to use a considerably strong spring in order to open the door by urging the elastic protruding bar in the protruding direction.

  The door opening assist mechanism disclosed in Patent Document 1 simply opens the door to the half-open state by the urging force of the elastic protruding bar when the handicapped person passes through the doorway of the handicapped, and opens the door to the handicapped person. Although it is intended to facilitate the passage of the doorway, for example, when a large force is applied to the door in the closing direction due to gusts, etc., the above-described opening assist mechanism configuration allows the elastic protruding rod even if the latch is released with the handle It is difficult to open the door only by the urging force of the spring. Especially in highly airtight houses such as condominiums, there is a pressure difference between indoors and outdoors, and women and children are very heavy and weak even when the front door is pushed open from the inside or pulled out from the outside. For the elderly, it is difficult to open and close the entrance door.

  An object of the present invention is to solve such a problem. For example, when a large force is applied in the closing direction with respect to the door of the entrance due to a gust of wind, etc. An object of the present invention is to provide a door opening assist device for facilitating opening of the door when it becomes very heavy with respect to the opening direction.

  The door opening assist device according to claim 1 of the present invention is an opening assist device that assists opening in the door opening direction when the door of the doorway is opened, and transmits power in the door opening direction to the casing. A pressing part that performs reciprocating movement of the pressing part, and a power part that includes a drive motor that operates the operating part and a power transmission mechanism. A male screw shaft connected from the rotary shaft through a power transmission mechanism, two plates slidable in the length direction of the male screw shaft, and both ends interposed between the two plates are coupled to the two plates. A buffer spring, and one of the two plates is provided with a female screw member that is screwed to the male screw shaft, and the two plates and the spring are integrally screwed together by the rotation of the male screw shaft. Moved in the length direction of the shaft The male screw shaft is configured such that the other end side of the connecting rod fixed to the other plate of the two plates is used as the pressing portion to move in and out of the opening of the casing. The two plates and the spring are integrally moved by the rotation of the connecting rod, and stress is transmitted to compensate for the force in the door opening direction by the pressing force of the pressing portion on the other end side of the connecting rod. To do.

  The door opening assist device according to claim 2 is an opening assist device that assists opening in the opening direction when the door of the doorway is opened, and a pressing portion that transmits power in the opening direction into the casing. And an operating part that allows the pressing part to reciprocate, and a driving part that operates the operating part, and a power part that includes a power transmission mechanism, the operating part from a rotation shaft of the driving motor. A worm connected via a power transmission mechanism, a worm gear meshing with the worm, an operation plate coaxially connected to the worm gear and mounted separately on the worm gear, and rotation of the worm gear linked to the operation plate A coil spring with one end locked to the worm gear side and the other end locked to the working plate side, and the rotation of the working plate transmitted from the worm gear, protrudes from the opening of the casing. Reciprocation is provided with the pressing portion capable to, by the pressing force of the pressing portion, characterized in that so as to stress transmission to compensate for the force of opening the door.

The door opening assist device according to claim 3 is characterized in that a pressing body is integrally provided in the pressing portion, and stress is transmitted by the pressing force of the pressing body so as to supplement the force in the direction of opening the door. To do.
The door opening assist device according to claim 4 is an opening assist device that assists opening in the door opening direction when the door of the doorway is opened, and a pressing portion that transmits power in the door opening direction to the casing. And an operating part that reciprocates the pressing part, and a power part that includes a drive motor that operates the operating part and a power transmission mechanism, and the operating part passes through the power transmission mechanism from the rotating shaft of the drive motor. A male screw shaft that is connected, two plates that are slidable in the length direction of the male screw shaft, and a shock-absorbing spring that is interposed between the two plates and has both ends coupled to the two plates, One of the two plates is provided with a female screw member that is screwed onto the male screw shaft, and the two plates and the spring are integrally moved in the length direction of the male screw shaft by rotation of the male screw shaft. Configured before The other end side of the connecting rod fixed to one of the two plates is the pressing portion, the pressing body is provided integrally with the door, the pressing body insertion portion is formed in the casing, and the male screw shaft The two plates and the spring are integrally moved by the rotation, and stress is transmitted to compensate for the force in the direction of opening the door by the pressing force from the pressing portion to the pressing body.

  The door opening assist device according to claim 5 is an opening assist device that assists opening in the door opening direction when the door of the doorway is opened, and a pressing portion that transmits power in the door opening direction to the casing. And an operating part that reciprocates the pressing part, and a power part that includes a drive motor that operates the operating part and a power transmission mechanism, and the operating part passes through the power transmission mechanism from the rotating shaft of the drive motor. The connected worm, the worm gear meshing with the worm, the operation plate coaxially connected to the worm gear and mounted separately on the worm gear, and one end of the worm gear on the worm gear side in order to link the rotation of the worm gear to the operation plate The door includes a coil spring that is stopped and the other end is locked to the operating plate side, and the pressing portion that can reciprocate by the rotation of the operating plate transmitted from the worm gear. A pressing body is provided integrally, a pressing body insertion portion is formed in the casing, and stress is transmitted to supplement the force in the door opening direction by the pressing force from the pressing portion to the pressing body. To do.

  According to a sixth aspect of the present invention, there is provided the door opening assist device, wherein the pressing member inserted into the casing is configured to be locked by inserting a pin and coupling it with the casing.

  As described above, the door opening assist device according to the present invention has a direction in which a large force is applied in the closing direction with respect to the entrance door due to, for example, a gust of wind, or the direction in which the entrance door is opened due to a difference in atmospheric pressure between indoors and outdoors. However, the door can be easily opened by rotating the drive motor to move the pressing portion and pushing the door open by the pressing portion. Further, since a spring is interposed between the two plates, even if an impact is applied to the pressing portion when the door is pushed open, the impact can be absorbed by the spring force. In addition, since a coil spring is interposed between the worm gear and the operation plate, even if an impact is applied to the pressing portion when the door is pushed open, the impact can be absorbed by the spring force. In addition, when the pressing body is provided integrally on the door side and the pressing portion presses the pressing body, the same effect is obtained. With this pressing body inserted into the casing, a pin is inserted and coupled with the casing Can be locked.

Embodiments of the present invention will be specifically described below with reference to the drawings.
First, the first embodiment shown in FIGS. 1 to 6 will be described. Reference numeral 1 denotes an entrance door whose one side is rotatably supported by a vertical frame 3 of an entrance 2 by a hinge (not shown). A handle 4 incorporating a latch lock is provided on the other side of the front door 1 opposite to the hinge support side. An opening assisting device 6 is attached to the upper frame 5 of the doorway 2 located on the other side of the handle 4, that is, on the door side, on the indoor side, facing the entrance door 1.

  The opening assist device 6 is attached to the lower surface of the upper frame 5 so as to face the upper end inner surface of the entrance door 1. In the casing 7 of the opening assisting device 6, there are a drive motor 8, a gear 9 attached to a rotary shaft 8 a of the drive motor 8, and a shaft 10 parallel to the rotary shaft 8 a so as to mesh with the gear 9. A gear 11 attached to one end of the shaft, a gear 12 attached to the other end of the shaft 10 to which the gear 11 is attached, and a male screw shaft 13 parallel to the shaft 10 so as to mesh with the gear 12. The drive motor 8 is configured to reduce the rotational speed of the drive motor 8 and amplify the rotational force of the drive motor 8. And these gears 9, 11, 12, and 14 are provided so that it may be located in the one end side in the said casing 7. FIG. The male screw shaft 13 has a length from the other end side of the casing 7 to the position closer to the other end side toward the other end side in the casing 7. A bearing 15 supports the male screw shaft 13. The male screw shaft 13 includes a buffer tension spring 16 and two plates 17 and 18 that are coupled to both ends of the tension spring 16 with both ends of the tension spring 16 being slidable in the length direction of the male screw shaft 13. Is provided. A round hole (not shown) is formed in the two plates 17 and 18 so as to be slidably fitted to the male screw shaft 13, and on the inner surface side of one plate 17 facing the other end side of the casing 7. A female screw member 19 that is screwed onto the male screw shaft 13 is fixed. Reference numeral 20 denotes two connecting rods having one end fixed to the other plate 18 so as to sandwich the male screw shaft 13 and the other end penetrating the one plate 17 and coupled to the door pressing tool 21. The door pressing tool 21 is disposed so as to be positioned on the other end side of the casing 7, and can be withdrawn from an opening 22 formed on the other end side of the casing 7.

  The opening assisting device 6 configured as described above is attached to the upper frame 5 of the doorway 2 so that the other end side of the casing 7, that is, the door pressing tool 21 is close to the upper end inside the entrance door 1. When the opening assisting device 6 is not in operation, as shown in FIG. 4, the tension spring 16 is contracted and is sandwiched between the two plates 17 and 18 so as to be positioned on one end side of the casing 7 and press the door. 21 is in a state of not projecting from the opening 22.

  When you want to open the entrance door 1, release the latch and grasp the handle 4 to open the entrance door 1. For example, if the entrance door is very heavy due to the atmospheric pressure difference between indoors and outdoors. , By pushing a switch (not shown) to rotate the drive motor 8 in the forward direction, the rotation is transmitted to the gear 9 → the gear 11 → the gear 12 → the gear 14 and the male screw shaft 13 is rotated together with the female screw member 19. One plate 17 moves on the male screw shaft 13 toward the other end of the casing 7. That is, the rotation of the male screw shaft 13 causes the one plate 17 to move together with the female screw member 19 because the two connecting rods 20 pass through the one plate 17, and the rotation of the male screw shaft 13 causes the female screw member 19 to move. Moreover, it is because one plate 17 is comprised so that it may not rotate together. As described above, when one plate 17 moves on the male screw shaft 13, the contracted tension spring 16 and the other plate 18 also move on the male screw shaft 13, whereby one end is fixed to the other plate 18. As shown in FIG. 5, the door pressing tool 21 attached to the other end of the connecting rod 20 protrudes from the opening 22 toward the entrance door 1 and pushes the entrance door 1 in the opening direction. That is, stress is transmitted by the pressing force from the door pressing tool 21 so as to supplement the force in the direction of opening the door 1. By opening the entrance door 1 even a little by such an operation, there is no pressure difference between indoors and outdoors, and the entrance door 1 can be easily opened by hand. When the door pressing tool 21 protrudes from the opening 21 toward the entrance door 1 to push open the entrance door 1, a slight impact is applied to the door pressing tool 21, but the impact extends the tension spring 16 from the other plate 18. It is absorbed by the force acting on. Several seconds after the door door 1 is pushed open by the protrusion of the door pressing tool 21, the drive motor 8 is reversed and the male screw shaft 13 is also reversed, and the two springs 17 and 18 are moved with the tension spring 16 contracted. The casing 7 is moved to one end side to automatically return to the state shown in FIG.

  By the way, when the drive motor 8 is driven by pushing the switch without releasing the latch of the front door 1, the door pressing tool 21 cannot protrude from the opening 22, and one plate 17 as shown in FIG. Only moves on the male screw shaft 13 and the tension spring 16 is extended.

  Next, a second embodiment shown in FIGS. 7 to 10 will be described. In the first embodiment, the impact is absorbed by the tension spring 16 interposed between the two plates 17 and 18 or a large amount is applied. Although the load can be absorbed, in the second embodiment, a buffering compression spring 23 is interposed between the two plates 17 and 18, and the compression spring 23 absorbs an impact or a large amount. The load can be absorbed. In the second embodiment, the compression spring 23 is interposed between the two plates 17 and 18, the female screw member 19 that is screwed to the male screw shaft 13 is fixed to the other plate 18, and The configuration is different from that of the first embodiment in that one end of the two connecting rods 20 whose other ends are coupled to the door pressing tool 21 is fixed to the plate 17.

  In this second embodiment, the rotation of the gear 9 → the gear 11 → the gear 12 → the gear 14 is transmitted by pushing the switch with the latch of the front door 1 released to drive the drive motor 8, and the male screw shaft 13 8 rotates and the other plate 18 together with the female screw member 19 moves on the male screw shaft 13 toward the other end of the casing 7 from the state shown in FIG. At the same time, the compression spring 23 and the one plate 17 also move on the male screw shaft 13, whereby the door pressing tool attached to the other end of the connecting rod 20 whose one end is fixed to the one plate 17. As shown in FIG. 9, 21 projects from the opening 22 toward the entrance door 1 and is pushed in the direction of opening the entrance door 1. That is, stress is transmitted by the pressing force from the door pressing tool 21 so as to supplement the force in the direction of opening the door 1. By opening the entrance door 1 even a little by such an operation, there is no pressure difference between indoors and outdoors, and the entrance door 1 can be easily opened by hand. When the door pressing tool 21 protrudes from the opening 22 toward the entrance door 1 to push open the entrance door 1, a slight impact is applied to the door pressing tool 21, but the impact causes the compression spring 23 to contract from one plate 17. It is absorbed by the force acting on.

  When the drive motor 8 is driven by pushing the switch without releasing the latch of the entrance door 1, the door pressing tool 21 cannot protrude from the opening 22, and only the other plate 18 is male screwed as shown in FIG. The compression spring 23 is contracted between the two plates 17 and 18 by moving on the shaft 13.

  In short, in the two embodiments described above, in the casing 7, a pressing portion (door pressing tool 21) that transmits power in the opening direction and the pressing portion can be withdrawn from the opening portion 22 of the casing 7. An operating part (male screw shaft 13, two plates 17, 18, a tension spring 16 or a compression spring 23), a driving motor 8 for operating the operating part, and a power part comprising a power transmission mechanism (gears 9, 11, 12) The door 1 is pushed and opened by the door pressing tool 21 as a pressing body protruding from the opening 22, but without providing the door pressing tool 21 at the other end of the connecting rod 20. The other end of the connecting rod 20 may protrude from the casing 7, and the front door 1 may be pushed and opened directly at the other end of the connecting rod 20.

  Next, the third embodiment shown in FIGS. 11 to 15 will be described. The configuration of the opening assist device 24 of the third embodiment is different from that of the first and second embodiments in the power transmission mechanism. The configuration of the parts is different, and will be specifically described below.

  In the casing 25 of the opening assist device 24, a drive motor 26, a gear 27 attached to a rotary shaft 26 a facing the horizontal direction of the drive motor 26, and the rotary shaft 26 a so as to mesh with the gear 27 are parallel. A gear 29 attached to one end of the shaft 28, a gear 30 attached to the other end of the shaft 28 to which the gear 29 is attached, and one end of a shaft 31 parallel to the shaft 28 so as to mesh with the gear 30. An attached gear 32, a bevel gear 33 attached to the other end of the shaft 31 to which the gear 32 is attached, and a shaft 34 that is orthogonal to the shaft 31 and is horizontally oriented so as to mesh with the bevel gear 33. A bevel gear 35 attached to one end of the shaft, a worm 36 attached to the other end of the shaft 34 to which the bevel gear 35 is attached, and a vertical direction so as to mesh with the worm 36. A quarter-round worm gear 38 rotatably attached to the shaft 37 facing, a worm gear 38 and a semicircular actuating plate 39 which is coaxially mounted on the worm gear 38 and the worm gear 38 individually and rotatably. Rotation of the operating plate 39 transmitted from the worm gear 38, and a coil spring 40 having one end locked to the worm gear 38 and the other end locked to the operating plate 39. Thus, a door pressing rod 42 that can reciprocate so as to move in and out of the opening 41 of the casing 25 is provided. The power transmission mechanism from the gear 27 to the worm gear 38 is for decelerating the rotational speed of the drive motor 26, amplifying the rotational force of the drive motor 26, and transmitting it from the operating plate 39 to the door pressing rod 42. Incidentally, the operating plate 39 is provided with a connecting pin 43 protruding from the lower surface, and this connecting pin 43 is connected to the base end portion of the door pressing bar 42 and slides in the sliding direction of the door pressing bar 42. Is inserted into the recess 44a from above, and the rotation of the operation plate 39 is changed to the linear motion of the door pressing rod 42 and transmitted. Since the connecting pin 43 moves on the locus of the arc by the rotation of the operating plate 39, the connecting pin 43 and the sliding body can be moved within the width of the recessed portion 44a in the recessed portion 44a of the sliding body 44. 44 is connected with play. Reference numeral 45 denotes a guide member that guides the sliding of the sliding body 44.

  The opening assisting device 24 configured as described above is attached to the upper frame of the doorway in the same manner as in the first and second embodiments so that the front end of the door pressing bar 42 is close to the inside of the upper end of the entrance door 1. . When the opening assisting device 24 is not in operation, the sliding body 44 is at the inner end side position of the guide member 45 and the door pressing bar 42 does not protrude from the opening 41 as shown in FIG. ing.

  When you want to open the entrance door 1, release the latch and grasp the handle to open the entrance door 1, but if the entrance door 1 becomes very heavy with respect to the direction of opening the entrance door 1 due to, for example, the pressure difference between indoor and outdoor Then, by pressing a switch (not shown) to rotate the drive motor 26 in the forward direction, the rotation of the gear 27 → the gear 29 → the gear 30 → the gear 32 → the bevel gear 33 → the bevel gear 35 → the worm 36 → the worm gear 38 is performed. The rotation of the worm gear 38 is transmitted to the operating plate 39 via the coil spring 40, and the rotation of the operating plate 39 is transmitted to the door pressing rod 42 in a linear motion, whereby the door pressing rod 42 is as shown in FIG. It protrudes to the entrance door 1 side from the opening 41 and is pushed in the direction to open the entrance door 1. That is, stress is transmitted by the pressing force from the door pressing rod 42 to compensate for the force in the direction of opening the door 1. By opening the entrance door 1 even a little by such an operation, there is no pressure difference between indoors and outdoors, and the entrance door 1 can be easily opened by hand. When the door pressing bar 42 protrudes toward the entrance door 1 from the opening 41 to push open the entrance door 1, a slight impact is applied to the door pressing bar 42. The impact is applied from the door pressing bar 42 to the operation plate 39 and the operation plate. It is absorbed by being transmitted from 39 to the coil spring 40. A few seconds after the door 1 is pushed open by the protrusion of the door pressing bar 42, the drive motor 26 is reversed and all the components from the gear 27 to the operation plate 39 are reversed, and the door pressing bar 42 is shown in FIG. It automatically returns to the state.

  By the way, when the drive motor 26 is driven by pushing the switch without releasing the latch of the front door 1, the door pressing rod 42 cannot protrude from the opening 41, and the worm gear from the gear 27 as shown in FIG. 14 is rotated in the same manner as in the state shown in FIG. 14, but the door pressing rod 42 cannot protrude from the opening 41, so that the operation plate 39 cannot rotate, and the operation plate 39 and the worm gear 38 The coil spring 40 in between is in a contracted state.

  In short, in the third embodiment described above, a pressing portion (door pressing rod 42) that transmits power in the door opening direction into the casing 25 and an operating portion that allows the pressing portion to reciprocate so that it can be moved out and out. A worm 36, a worm gear 38, an actuating plate 39, a coil spring 40), a driving motor 26 for operating the actuating part, and a power part comprising a power transmission mechanism (gears 27, 29, 30, 32, bevel gears 33, 35). The door 1 is pushed and opened by a door pressing bar 42 protruding from the opening 40. A door pressing tool as a pressing body is provided at the tip of the door pressing bar 42, and the door is pressed. The entrance door 1 may be pushed open with a tool.

  The opening assisting devices 6 and 24 of the three embodiments described above are attached to the upper frame 5 of the doorway 2 on the door end side (see FIG. 16A), but as shown in FIG. It may be attached to the upper frame 5 of the doorway 2 at an intermediate position between the door tip and the suspension base, or may be attached to the upper end of the vertical frame on the door tip side as shown in FIG. Moreover, as shown in FIG. 16D, it may be attached to the lower end of the vertical frame on the door end side.

  Further, in the above-described three embodiments, the entrance door 1 is pushed open by the pressing portion or the pressing body protruding from the casing. However, the pressing body is integrally provided on the entrance door 1 side, You may make it form a pressing body insertion part and push open the front door 1 by the pressing force to the pressing body from the pressing part in a casing. And you may make it lock by inserting a pin with respect to the press body inserted in this casing, and making it couple | bond with a casing. Furthermore, although three embodiment described above is an opening assistance apparatus of the entrance door 1 of a building, it is not limited to an entrance door.

It is a perspective view of the opening assistance apparatus in the 1st Embodiment of this invention. It is a schematic sectional side view which shows the attachment state of the opening assistance apparatus. It is a schematic front view which shows the attachment state of the opening assistance apparatus. It is a top view of the opening assistance apparatus. It is a top view which shows the state by which the front door was pushed open by the opening assistance apparatus. It is a top view which shows the state by which the switch was pushed, without releasing the latch of the entrance door. It is a perspective view of the opening assistance apparatus in the 2nd Embodiment of this invention. It is a top view of the opening assistance apparatus. It is a top view which shows the state by which the front door was pushed open by the opening assistance apparatus. It is a top view which shows the state by which the switch was pushed, without releasing the latch of the entrance door. It is a perspective view of the opening assistance apparatus in the 3rd Embodiment of this invention. It is a top view of the opening assistance apparatus. It is sectional drawing of the opening assistance apparatus. It is a top view which shows the state by which the front door was pushed open by the opening assistance apparatus. It is a top view which shows the state by which the switch was pushed, without releasing the latch of the entrance door. (A)-(D) are explanatory drawings which show the example of attachment of the opening assistance apparatus in three embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Entrance door 2 Entrance / exit 3 Vertical frame 4 Handle 5 Upper frame 6 Opening assist device 7 Casing 8 Drive motor 8a Rotating shaft 9 Gear 10 Shaft 11 Gear 12 Gear 13 Male screw shaft 14 Gear 15 Bearing 16 Pull springs 17 and 18 Plate 19 Female screw member 20 connecting rod 21 door pressing tool 22 opening 23 compression spring 24 opening assist device 25 casing 26 drive motor 26a rotating shaft 27 gear 28 shaft 29 gear 30 gear 31 shaft 32 gear 33 bevel gear 34 shaft 35 bevel gear 36 worm 37 shaft 38 Worm gear 39 Actuating plate 40 Coil spring 41 Opening 42 Door pressing rod 43 Connecting pin 44 Sliding body 44a Recess 45 Guide member

Claims (6)

When opening the door of the doorway, it is an opening assist device that assists in opening in the opening direction, and can be moved in and out of the casing by reciprocating the pressing portion that transmits power in the opening direction. An operating part that operates, a drive motor that operates the operating part, and a power part that includes a power transmission mechanism. The operating part includes a male screw shaft that is connected to the rotation shaft of the drive motor via a power transmission mechanism, and the male screw. One of the two plates, comprising two plates slidable in the length direction of the shaft, and a buffering spring interposed between the two plates and having both ends coupled to the two plates One plate is provided with a female screw member that is screwed onto the male screw shaft, and is configured to move the two plates and the spring integrally in the length direction of the male screw shaft by rotation of the male screw shaft. Any of the plates The other end of the connecting rod fixed to the other plate is used as the pressing portion so as to move out of the opening of the casing, and the two plates and the spring are moved together by the rotation of the male screw shaft. The door opening assisting device is characterized in that stress is transmitted by the pressing force of the pressing portion on the other end side of the connecting rod to compensate for the force in the door opening direction. When opening the door of the doorway, it is an opening assist device that assists in opening in the opening direction, and can be moved in and out of the casing by reciprocating the pressing portion that transmits power in the opening direction. A driving motor that operates the operating unit, and a power unit that includes a power transmission mechanism. The operating unit includes a worm that is connected to the rotating shaft of the drive motor via a power transmission mechanism, and the worm. The meshing worm gear, the worm gear coaxially with the worm gear, and the worm gear individually attached to the worm gear, and one end locked to the worm gear side in order to link the rotation of the worm gear to the operative gear, and the other end The coil spring locked to the operating plate side and the press capable of reciprocating so as to move back and forth with respect to the opening of the casing by the rotation of the operating plate transmitted from the worm gear. It includes a, by the pressing force of the pressing portion, the opening motion assist device of the door, characterized in that so as to stress transmission to compensate for the force of opening the door. The door opening assisting device according to claim 1 or 2, wherein a pressing body is integrally provided in the pressing portion, and stress is transmitted by a pressing force of the pressing body so as to compensate for the force in the door opening direction. . An opening assist device that assists opening in the door opening direction when opening the door of the doorway, a pressing portion that transmits power in the opening direction into the casing, an operating portion that reciprocates the pressing portion, and an operation A drive motor that operates the power unit and a power unit that includes a power transmission mechanism, and the operating unit includes a male screw shaft that is connected to the rotation shaft of the drive motor via the power transmission mechanism, and a length direction of the male screw shaft. Two slidable plates, and a buffer spring interposed between the two plates and having both ends coupled to the two plates, and one of the two plates includes the above-mentioned plate A female screw member that is screwed onto the male screw shaft is provided, and the two plates and the spring are integrally moved in the length direction of the male screw shaft by rotation of the male screw shaft. Play The other end side of the connecting rod fixed to is used as the pressing portion, the pressing body is integrally provided on the door, the pressing body insertion portion is formed on the casing, and the two plates and the spring are integrated by the rotation of the male screw shaft. The door opening assisting device is characterized in that stress is transmitted to compensate for the force in the door opening direction by the pressing force from the pressing portion to the pressing body. An opening assist device that assists opening in the door opening direction when opening the door of the doorway, a pressing portion that transmits power in the opening direction into the casing, an operating portion that reciprocates the pressing portion, and an operation A drive motor that operates the power supply unit and a power transmission unit that includes a power transmission mechanism, and the operation unit includes a worm that is connected to the rotation shaft of the drive motor via the power transmission mechanism, a worm gear that meshes with the worm, The operating plate is coaxially connected to the worm gear, and the worm gear is rotatably attached to the worm gear, and one end is locked to the worm gear side and the other end is locked to the operating plate side in order to link the rotation of the worm gear to the operating plate. And the pressing portion capable of reciprocating by the rotation of the working plate transmitted from the worm gear. Forming a pressure body insertion portion, the pressing force to the pressing member from the pressing portion, the opening motion assist device of the door, characterized in that so as to stress transmission to compensate for the force of opening the door. 6. The door opening assist device according to claim 4 or 5, wherein the pressing member inserted into the casing is configured to be locked by inserting a pin and coupling it with the casing.

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