JP2016199869A - Hinge device for automatic door closing, and swing door provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinge device for automatic door closing that maintains smooth door opening/closing over a long period.SOLUTION: On a mating surface of two hinge components 7, 8 that face each other, a spirally upward inclining surface is formed on a fixed-side lower hinge component 7 side around a pivot shaft 6 from a start-up base point in a direction of door opening rotation, while a spirally downward inclining surface is formed on a movable-side upper hinge component 8 side around the pivot shaft 6 from the start-up base point in the direction of door opening rotation. Here, at least a form of the spirally inclined surface of the fixed-side lower hinge component 7 virtually coincides with a form of the spirally inclined surface of the movable-side upper hinge component 8. On the fixed-side lower hinge component 7, a wall surface is erected along an outer periphery side of the start-up base point for forming a lubricant storage part in an area including the start-up base point, and a circulation groove is formed along an outer peripheral part of the spirally inclined surface for returning lubricant to the lubricant storage part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an automatic door closing hinge device that automatically closes a door that is pivotally operated in a front-rear direction around a pivot shaft, and a swing door including the same.

  2. Description of the Related Art Conventionally, swing doors are used as partition doors between sales floors and eating places and kitchens and backyards in supermarkets, convenience stores, home centers, restaurants, and the like.

  This kind of swing door can be opened from either the front or rear side of the door by a cart loaded with luggage at the time of loading / unloading at a store etc., and the door automatically closes after passing A door is rotatably supported in the front-rear direction by a hinge device having a mechanism.

  As a hinge device provided with such a mechanism, in Patent Document 1 below, upper and lower pin means are provided so that an axis passing through the pins forms a small angle upward with one side edge of the door, and Disclosed is a combination of a roller and a slope on the cam that converts the vertical load generated by the weight of the door into a rotational force when the door is opened, so that the door falls inward and closes. Has been.

  Further, in Patent Document 2 below, the upper hinge is fixed to the door plate at the lower end, the shaft serving as the pivot shaft of the door plate, the upper end of the shaft orthogonal to the shaft, and the door A roller shaft penetrating in a direction orthogonal to the surface of the plate, a roller rotatably supported at both ends of the roller shaft, and a roller rotating around the shaft; and the roller shaft is orthogonal to the surface of the door plate A swing door including a cam plate formed with a cam groove for guiding the roller so as to be in a direction is disclosed.

  Furthermore, in the following Patent Document 3, the lower hinge portion includes a gravity hinge mechanism for returning and rotating the door member by the vertical movement of the door member and its own weight, and the lower hinge shaft is erected on the bracket. A cam body having a sloped upper cam surface is attached, and a cam receiving cylinder body having a sloped bottom cam surface is attached to the bottom surface of the door member through a mounting plate. Have been described.

Japanese Examined Patent Publication No. 43-9160 JP 2012-202091 A JP2013-124466A

  However, in the hinge devices described in Patent Documents 1 and 2, the door is automatically closed because the door is held closed by fitting the roller into the cam groove formed in the V-shaped cross section of the support plate. When the roller is closed, a large impact is generated when the roller fits into the cam groove, and when the door is opened, a large impact is generated when the roller comes out of the cam groove, thereby opening and closing the door smoothly. I couldn't.

  Further, in the hinge device described in Patent Documents 1 and 2, when the door is automatically closed, the roller rotates on the support plate, and finally the roller fits into the cam groove and stops suddenly. Although the rotation of the shaft stops, there is a problem that the entire door vibrates greatly due to the reaction. The doors used for swing doors are relatively thin and have a small damping effect, and the vibration continues for a long time and is difficult to converge.Therefore, the door may be adversely affected the next time it is opened, and an unpleasant sound may be emitted from the door. There was also a case.

  Furthermore, in a hinge device equipped with a mechanism in which the roller rotates the support plate, the roller supports the weight of the door by the line contact with the support plate in theory, so pressure concentrates and the door cannot be opened and closed smoothly. There was a case.

  Further, in the hinge device described in Patent Document 3, the upper cam surface of the cam body and the bottom cam surface of the cam receiving cylinder body are in surface contact, and these surfaces slide while opening and closing the door. Due to the deterioration over time, the movement of the sliding surface may be deteriorated or the play may occur due to wear. Further, if these contact surfaces are simply lubricated with a lubricant in order to improve the movement of the sliding surface, the lubricant leaks out to the outer periphery and is lost immediately, and the lubricating effect may not be maintained.

  Accordingly, a main object of the present invention is to provide a hinge device for automatic closing and a swing door including the same, which can maintain a smooth door opening and closing over a long period of time.

In order to solve the above-mentioned problem, as the present invention according to claim 1, there is provided a hinge device for automatic closing having a mechanism for automatically closing a door that is pivotally operated in the front-rear direction around a pivot shaft,
The hinge device includes a fixed-side lower hinge part that is directly or indirectly fixed to the frame body side, and is directly or indirectly fixed to the door, and rotates about the pivot shaft in conjunction with opening and closing of the door. And a movable upper hinge part installed on the upper surface of the fixed lower hinge part,
The starting base point formed so that the fixed side lower hinge part side includes a radial line centering on the pivot axis at an arbitrary position on the facing surface of the fixed side lower hinge part and the movable side upper hinge part facing each other While forming a spiral inclined surface with an upward inclination centering on the pivot axis from the center in the forward and rearward opening rotation directions, the movable-side upper hinge part is centered on the pivot axis at an arbitrary position. Forming a downwardly inclined spiral inclined surface centering on the pivot shaft from the starting base portion formed so as to include the radial line to the front and rear opening rotation directions, respectively, and at least the The shape of the spiral inclined surface of the fixed-side lower hinge part substantially matches the shape of the spiral inclined surface of the movable-side upper hinge part,
The fixed lower hinge part has a standing wall surface along the outer peripheral side of the starting base point portion, and has a region including the starting base point portion as a lubricant reservoir, and along the outer peripheral portion of the spiral inclined surface. Thus, there is provided a hinge device for automatic door closing, wherein a reflux groove for returning the lubricant to the lubricant reservoir is formed.

  In the first aspect of the present invention, as the hinge device having a mechanism for automatically closing the door, a device in which the fixed lower hinge component and the movable upper hinge component are vertically arranged facing each other is used. Specifically, in the mating surface of the fixed side lower hinge part and the movable side upper hinge part facing each other, the fixed side lower hinge part includes a radial line centered on the pivot axis at an arbitrary position. While forming a spiral inclined surface with an upward inclination centering on the pivot axis from the starting starting point portion formed in the forward and rearward opening rotation directions, the movable upper hinge part pivots to an arbitrary position. From the starting base point formed so as to include a radial line centering on the shaft, a downwardly inclined spiral inclined surface centering on the pivot shaft is formed toward the front and rear opening rotation directions. . In addition, at least the shape of the spiral inclined surface of the fixed lower hinge component and the shape of the spiral inclined surface of the movable upper hinge component are substantially matched.

  In the hinge device configured as described above, by opening the door forward or backward, the movable-side upper hinge part rotates around the pivot shaft, and at the same time, the rotational direction of the movable-side upper hinge part The movable inclined upper surface moves upward along the axial direction of the pivot shaft as the spiral inclined surface rises while sliding along the helical inclined surface in the same direction of the fixed lower hinge component. . At this time, the door is lifted upward by the amount that the movable-side upper hinge part is raised. Thereafter, when the opening operation of the door is released, the movable side upper hinge part descends while sliding on the spiral inclined surface of the fixed side lower hinge part due to the dead weight of the door. Moves downward along the pivot axis, and at the same time, the movable upper hinge part rotates about the pivot axis in the door closing direction to automatically close the door. Then, the door is held in a closed state at a position where the mating surface shape of the fixed lower hinge part matches the mating surface shape of the movable upper hinge part. As described above, when the door is opened and automatically closed, a large impact does not occur, and the door can be opened and closed smoothly.

  Further, in this hinge apparatus, after the movable upper hinge part descends while sliding on the helical inclined surface of the fixed lower hinge part, the helical inclined surface on the opposite side is temporarily moved beyond the closed position by the inertial force. By repeating the operation of slightly raising the position, the inertia force is attenuated while the door swings back and forth immediately before the door is closed, so that the door is placed in the closed state. Accordingly, the vibration of the door itself due to the sudden stop does not occur, and the door closes quickly.

  Further, in this hinge device, the weight of the door is supported by the surface contact of the spiral inclined surface of the movable upper hinge part and the spiral inclined surface of the fixed lower hinge part. Becomes smooth.

  In the present hinge device, the fixed lower hinge part has a standing wall surface along the outer peripheral side of the starting base point portion, and a region including the starting base point portion serves as a lubricant reservoir, and the spiral shape A reflux groove for returning the lubricant to the lubricant reservoir is formed along the outer periphery of the inclined surface. Therefore, the space between the spiral inclined surface of the fixed-side lower hinge part and the spiral inclined surface of the movable-side upper hinge part is always lubricated by the lubricant. Aging deterioration of the surface is suppressed to be extremely small, and smooth opening and closing of the door can be maintained over a long period of time. Further, since the return groove is formed on the spiral inclined surface of the fixed lower hinge part, the lubricant on the spiral inclined surface is returned to the lubricant reservoir through the return groove and is prevented from leaking to the outer periphery. become able to. For this reason, smooth opening and closing of the door can be maintained over a long period of time.

  According to a second aspect of the present invention, there is provided the automatic door closing hinge device according to the first aspect, wherein the starting base point portion is formed linearly along a radial line centered on the pivot shaft.

  According to a third aspect of the present invention, there is provided the automatic closing hinge device according to the first aspect, wherein the starting base point portion is formed in a fan shape with two radial lines centering on the pivot shaft at both ends. .

  According to the second and third aspects of the present invention, as the shape of the starting base point portion, a linear shape along a radial line centered on the pivot axis and two radial lines centered on the pivot axis are used. Is defined as a fan shape with both ends as the ends.

  As a fourth aspect of the present invention, in the movable-side upper hinge part, a recessed lubricant pocket is formed on the spiral inclined surface adjacent to or close to the starting base point portion for opening the door. The automatic door closing hinge device according to any one of claims 1 to 3, wherein a lubricant staying in the lubricant pocket is scraped to a spiral inclined surface by the rotation of the movable upper hinge part. Is provided.

  In the invention according to claim 4, in the movable side upper hinge part, a recessed lubricant pocket is formed on the spiral inclined surface adjacent to or close to the starting base point portion, and accompanying the door opening operation. By rotating the movable upper hinge part, the lubricant staying in the lubricant reservoir is scraped up to the spiral inclined surface, so that the lubricant diffuses on the spiral inclined surface and opens and closes the door smoothly. Can be maintained.

  As a fifth aspect of the present invention, there is provided a swing door including the automatic door closing hinge device according to any one of the first to fourth aspects, at one or both of the upper end and the lower end of the door.

  As described above in detail, according to the present invention, it is possible to provide an automatic door closing hinge device capable of maintaining a smooth door opening and closing over a long period of time and a swing door including the hinge device.

1 is a front view of a swing door 1 according to the present invention. 4 is a front view of the upper hinge device 4. FIG. 4 is a bottom view of the upper hinge device 4. FIG. 4 is a side view of the upper hinge device 4. FIG. The fixed side lower hinge part 7 is shown, (A) is a top view, (B) is a front view, (C) is a bottom view, and (D) is a side view. The fixed side lower hinge part 7 is shown, (A) is a perspective view from above, and (B) is a perspective view from below. The movable side upper hinge part 8 is shown, (A) is a top view, (B) is a front view, (C) is a bottom view, and (D) is a side view. The movable side upper hinge part 8 is shown, (A) is a perspective view from above, and (B) is a perspective view from below. The fixed state of the movable side upper hinge part 8 and the door 3 is shown, (A) is a top view and (B) is a front view. It is a front view which shows the lower hinge apparatus 5. FIG. It is a XI-XI line arrow directional view of FIG. It is a front view which shows the relationship between the fixed side lower hinge part 7 and the movable side upper hinge part 8 at the time of a door closing. It is a front view which shows the relationship between the fixed side lower hinge part 7 and the movable side upper hinge part 8 at the time of door opening. It is a perspective view which shows the relationship between the fixed side lower hinge part 7 and the movable side upper hinge part 8 at the time of a door closing. It is a perspective view which shows the relationship between the fixed side lower hinge part 7 of a door opening indication, and the movable side upper hinge part 8. FIG. It is a perspective view of the fixed side lower hinge part 7 which concerns on the other example of a form. It is a top view of fixed side lower hinge part 7 concerning other examples.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The swing door 1 according to the present invention has an upper frame 2A and left and right vertical frames 2B and 2B. A double door left and right doors 3 and 3 have an upper hinge device 4 and a lower hinge at the upper and lower ends, respectively. It is supported by the device 5 so as to be rotatable in the front-rear direction.

[Upper hinge device 4]
As shown in FIG. 2, the upper hinge device 4 that supports the upper end of the door 3 is for automatic door closing having a mechanism that automatically closes the door 3 that is pivotally operated around the pivot shaft 6. It is a hinge device.

  As shown in detail in FIGS. 2 to 4, the upper hinge device 4 includes a fixed-side lower hinge part 7 that is directly or indirectly fixed to the frame body 2 side and a door 3 directly or indirectly. And is fixed to the door 3 and rotates about the pivot shaft 6 in conjunction with the opening and closing of the door 3. The movable upper hinge part 8 is installed on the upper surface of the fixed lower hinge part 7. The upper surface of the hinge part 7 and the lower surface of the movable upper hinge part 8 are installed facing each other.

  The pivot shaft 6 is suspended from an L-shaped fixing bracket 9 composed of an upper surface portion 9a and a side surface portion 9b so as not to rotate at the central portion of the upper surface portion 9a. As for the said fixing metal fitting 9, the upper surface part 9a and the side part 9b are screwed to the upper frame 2A and the vertical frame 2B of the frame 2, respectively.

  The pivot shaft 6 is installed such that the axial direction coincides with the vertical direction. Thereby, since the door 3 rotates around the vertical axis while maintaining a state perpendicular to the floor surface, the appearance when the door 3 is opened is improved.

  As shown in FIG. 2, the pivot shaft 6 includes a columnar body shaft portion 6a, a substantially quadrangular columnar hinge part fixing shaft portion 6b protruding from the lower end of the body shaft portion 6a, and the body shaft portion. It is comprised from the substantially square pillar-shaped metal fitting fixing shaft part 6c which protrudes at the upper end of 6a.

  As shown in FIG. 2, the fixed-side lower hinge part 7 is fixed to the lower end portion of the pivot shaft 6 so that it cannot rotate but cannot move vertically along the axial direction. As shown in FIGS. 5 and 6, the fixed-side lower hinge part 7 is a member having a substantially circular shape in plan view, and a circular shaft for inserting the main body shaft portion 6a of the pivot shaft 6 into the center portion of the upper surface. An insertion part 7a is formed, and a substantially rectangular opening 7b for inserting the hinge part fixing shaft part 6b of the pivot shaft 6 is formed at the center part of the lower surface. The shaft insertion part 7a and the opening 7b serve as shafts. It communicates in the direction. Further, as shown in FIG. 5C, a concave portion 7c formed in a planar shape larger than the opening 7b is provided on the lower surface of the fixed-side lower hinge part 7. As shown in FIG. 2, the recess 7 c is fitted with a contact plate 10 having a substantially square opening into which the hinge part fixing shaft 6 b of the pivot shaft 6 is inserted at the center. It has become.

  As shown in FIGS. 5 and 6, the mating surface of the fixed side lower hinge part 7 facing the movable side upper hinge part 8, that is, the upper surface of the fixed side lower hinge part 7, is located at an arbitrary position as shown in FIGS. From the starting base portion 11 formed so as to include a radial line centering on the center, the upward and downward spiral inclined surfaces 12, 12 centering on the pivot shaft 6 in the forward and rearward opening directions, respectively. Is formed. That is, on the upper surface of the fixed-side lower hinge part 7, the spirally inclined surface 12 of the right-handed spiral and the spirally-sloped surface of the left-handed spiral along the axial direction of the pivot shaft 6 on both sides from the starting base point portion 11 12 is formed. In the illustrated example, on the opposite side of the starting base portion 11 from the pivot shaft 6, a linear ridge line is formed along the radial direction centering on the pivot shaft 6, in which both spiral inclined surfaces 12, 12 face each other. Is formed.

  The spiral inclined surface is an inclined surface having a component that moves in the axial direction while rotating spirally around the pivot shaft 6, and a radial line at an arbitrary position of the inclined surface is a rotation center axis. It is the inclined surface formed so as to be orthogonal to.

  The starting base part 11 is a part that becomes a starting base point when the door in the closed state is opened and opened in the front-rear direction, and is described in detail later with the starting base part 11 of the fixed lower hinge part 7. In a state where the starting base portion 14 of the movable upper hinge part 8 to be described is combined, the helical inclined surfaces 12 and 12 of the fixed lower hinge part 7 and the helical inclined surfaces 15 and 15 of the movable side upper hinge part 8 Are formed so as to face each other.

  As shown in FIGS. 5 and 6, the starting base portion 11 is formed in a fan shape with two radial lines centering on the pivot shaft 6 as both ends. When the starting base point portion 11 is formed in a fan shape, the starting base point portion 11 is preferably formed almost flat over the entire surface, but a recess for storing a lubricant may be provided.

  On the other hand, the movable-side upper hinge part 8 is installed on the upper surface of the fixed-side lower hinge part 7 so as to be rotatable and vertically movable with respect to the pivot shaft 6, as shown in FIG. As shown in FIGS. 7 and 8, the movable-side upper hinge part 8 is a member having a substantially circular shape in plan view, and a circular shaft inserted through the main body shaft portion 6a of the pivot shaft 6 at the center portion. A portion 8a is formed. Further, the upper surface is provided with a substantially square engaging convex portion 8b for engaging with the connecting member 16 for connecting to the door 3, and screw holes 8c, 8c for fixing the connecting member 16 with screws. Is formed.

  As shown in FIGS. 7 and 8, the mating surface of the movable side upper hinge part 8 facing the fixed side lower hinge part 7, that is, the lower surface of the movable side upper hinge part 8, has a pivot shaft 6 at an arbitrary position. Helical inclined surfaces 15, 15 that are inclined downward from the starting base portion 14 formed so as to include the radial line at the center and centering on the pivot shaft in the forward and rearward opening rotation directions are formed. Has been. When the downwardly inclined spiral inclined surface 15 is arranged with the mating surface facing the fixed lower hinge part 7 facing upward (when arranged upside down in FIG. 7B), the start This means that the inclination angle from the base point portion 14 is formed in a downward slope, and the downward inclination is made opposite to the upward spiral inclined surface 12 of the fixed-side lower hinge part 7. .

  At least, the shape of the spiral inclined surface 12 of the fixed-side lower hinge part 7 and the shape of the spiral inclined surface 15 of the movable-side upper hinge part 8 substantially coincide with each other. That is, when the door 3 is closed, the spiral inclined surfaces 12 and 12 of the fixed lower hinge part 7 and the spiral inclined surfaces 15 and 15 of the movable upper hinge part 8 are in surface contact with each other. Further, the shape of the starting base point portion 11 of the fixed side lower hinge part 7 and the shape of the starting base point part 14 of the movable side upper hinge part 8 substantially coincide with each other, so that the starting base point is in the closed state of the door 3. The parts 11 and 15 may be brought into surface contact over the entire surface, or the starting base parts 11 and 15 are closed in a closed state by providing hollow parts in both or one of the starting base parts 11 and 15. You may make it not surface contact over the whole surface.

  In order to fix the movable-side upper hinge part 8 to the door 3, as shown in FIG. 9, a notch for attaching the upper hinge device is provided at the upper end of the door 3, and the front side along the periphery of the notch is provided. A substantially U-shaped fixing member 17 is arranged on one side in the front-rear direction of the door 3, and a U-shaped back plate 18 is arranged on the other side of the door 3, and the fixing member 17, the door 3, and the back plate are arranged. The fixing member 17 is fixed to the door 3 by bolts that integrally penetrate 18, and fixing flanges 17 a and 17 a provided at the upper end of the fixing member 17 are respectively connected to the upper surface of the movable upper hinge part 8. This is done by fixing the connecting member 16 fixed to the base plate with a bolt.

[Lower hinge device 5]
On the other hand, as shown in FIGS. 10 and 11, the lower hinge device 5 that supports the lower end of the door 3 is provided with a cut at the lower end of the door 3, and a portion including the cut portion is on the outer surface side of the door 3. By fixing the lower hinge plates 19, 19 provided with bent portions 19 a bent in a garlic shape on the front and rear surfaces of the door 3, an opening 20 that opens to the lower end side of the door 3 is formed, By inserting a pivot shaft 21 erected from the floor surface side into the opening 20, the door 3 is rotatably supported around the pivot shaft 21. The pivot shaft 21 is fixed to an L-shaped fixing bracket 22 composed of a lower surface portion 22a and a side surface portion 22b while standing on the lower surface portion 22a, and the lower surface portion 22a of the fixing bracket 22 is a floor surface. And the side surface portion 22b is fixed to the vertical frame 2B of the frame body 2 so as to stand in the vertical direction from the floor surface side.

(Operating state)
Next, the operating state of the upper hinge device 4 for automatic door closing will be described. In the closed state of the door 3 shown in FIG. 1, the upper hinge device 4 has the mating surfaces of the fixed-side lower hinge part 7 and the movable-side upper hinge part 8 combined as shown in FIGS. 12 and 14. Yes.

  When the door 3 is opened forward or backward from this state, as shown in FIGS. 13 and 15, the movable upper hinge component 8 fixed to the door 3 in conjunction with the rotation of the door 3 is pivoted. 6, while rotating about the center 6, the spiral inclined surface 15 in the rotational direction of the movable side upper hinge part 8 moves upward while sliding on the spiral inclined surface 12 in the same direction of the fixed side lower hinge part 7. The side upper hinge part 8 moves upward along the axial direction of the pivot shaft 6. At this time, the door 3 is lifted upward by the amount by which the movable-side upper hinge part 8 is raised.

  Thereafter, when the opening operation of the door 3 is released, the door 3 descends while the movable-side upper hinge part 8 slides on the spiral inclined surface 12 of the fixed-side lower hinge part 7 due to its own weight. As a result, the movable-side upper hinge part 8 moves downward along the pivot shaft 6 and, at the same time, the movable-side upper hinge part 8 rotates about the pivot shaft 6 in the door closing direction and automatically closes the door.

  When the door 3 is automatically closed or when the door 3 is opened, since the mating surfaces of the fixed-side lower hinge part 7 and the movable-side upper hinge part 8 are joined together to maintain the closed door state, Smooth opening and closing is possible without a large impact.

  Further, the operation immediately before the door 3 is closed will be described in more detail. After the movable-side upper hinge part 8 descends while sliding on the spiral inclined surface 12 of the fixed-side lower hinge part 7, the inertial force By repeating the operation of once raising the spiral inclined surface 12 on the opposite side slightly beyond the door closing position, the inertia force is attenuated while the door 3 swings back and forth immediately before the door closing, and the door 3 is put into the door closing state. It becomes like this. Therefore, the vibration of the door 3 itself due to a sudden stop does not occur, and the door 3 quickly converges to the closed state.

  Further, in the upper hinge device 4, the spiral inclined surface 15 of the movable upper hinge component 8 and the spiral inclined surface 12 of the fixed lower hinge component 7 are in surface contact to support the weight of the door 3. The pressure applied to the hinge device is dispersed, the movement becomes smooth, and the door 3 can be opened and closed smoothly.

[Lubrication method]
Next, a method for lubricating the spiral inclined surfaces of the fixed-side lower hinge part 7 and the movable-side upper hinge part 8 will be described.

  As shown in FIGS. 5 and 6, the fixed-side lower hinge part 7 has a standing wall surface 23 having a predetermined height along the outer peripheral side of the starting base portion 11, and includes the starting base portion 11. Is preferably the lubricant reservoir 24. The standing wall surface 23 is formed up to an intermediate height of the spiral inclined surface 12.

  In order to prevent the lubricant retained in the lubricant reservoir 24 from leaking from the inner peripheral side of the fixed lower hinge part 7, as shown in FIGS. 2 and 9B, the fixed lower hinge It is preferable to provide a packing 13 on the bottom surface of the shaft insertion portion 7a (see FIGS. 5 and 6) of the component 7.

  As the lubricant, known ones used for lubrication between solids can be widely used, and the viscosity and fluidity of the lubricant are not particularly limited.

  In the movable-side upper hinge part 8, as shown in FIGS. 7 and 8, a recessed lubricant pocket 25 is formed on the spiral inclined surface 15 adjacent to or close to the starting base portion 14, and the door is opened. When the movable upper hinge part 8 is rotated in accordance with the opening operation 3, the lubricant staying in the lubricant pocket 25 is scraped up to the spiral inclined surface 12 of the fixed lower hinge part 7. preferable. The lubricant pocket 25 is provided at a position where it is immersed in the lubricant storage portion of the stationary lower hinge part 7 when the door 3 is closed, that is, at a position lower than the standing height of the standing wall surface 23.

  Further, in the fixed-side lower hinge part 7, as shown in FIGS. 5 and 6, a reflux groove 26 for returning the lubricant to the lubricant reservoir 24 along the outer peripheral portion of the spiral inclined surface 12 is provided. Preferably formed. The reflux groove 26 can prevent the lubricant from leaking to the outer periphery of the fixed-side lower hinge part 7.

[Other examples]
(1) In the above embodiment, the starting base portion 11 of the fixed-side lower hinge part 7 is formed in a fan shape with two radial lines centered on the pivot shaft 6 as both ends, but as shown in FIG. Further, it may be formed linearly along a radial line centering on the pivot shaft 6.

(2) As shown in FIG. 17, the fixed lower hinge part 7 and the movable upper hinge part 8 are each formed in a fan shape with two radial lines centering on the pivot shaft 6 at both ends at arbitrary positions. A first starting base portion 11A is provided, and on the opposite side of the pivot shaft 6 with respect to the first starting base portion 11A, two radial lines centered on the pivot shaft 6 are fan-shaped, and a planar first The two starting base points 27 may be provided, and the spiral inclined surfaces 12 and 12 may be formed so as to connect the first starting point 11A and the second starting point 27. In FIG. 17, the fixed side lower hinge part 7 is illustrated. By providing the first starting base part 11A and the second starting base part 27 in the fixed side lower hinge part 7 and the movable side upper hinge part 8, respectively, when the door 3 is opened, the movable side upper hinge part 8 At least a part of the first starting base point rides on the second starting base point 27 of the fixed lower hinge part 7, and the door 3 can be held open.

(3) In the above embodiment, the hinge device for automatic closing is used only for the upper hinge device 4, but it may be used only for the lower hinge device 5, or used for both the upper hinge device 4 and the lower hinge device 5. May be.
(4) In the above embodiment, the pivot shaft 6 to which the fixed side lower hinge part 7 and the movable side upper hinge part 8 are attached is fixed to the frame body side, but may be fixed to the door side.

  DESCRIPTION OF SYMBOLS 1 ... Swing door, 2 ... Frame body, 3 ... Door, 4 ... Upper hinge apparatus, 5 ... Lower hinge apparatus, 6 ... Pivot shaft, 7 ... Fixed side lower hinge part, 8 ... Movable side upper hinge part, 11 ... Start Reference point, 12 ... spiral inclined surface, 14 ... starting reference point, 15 ... spiral inclined surface

Claims (5)

A hinge device for automatic door closing having a mechanism for automatically closing a door that is pivotally operated in the front-rear direction around a pivot shaft,
The hinge device includes a fixed-side lower hinge part that is directly or indirectly fixed to the frame body side, and is directly or indirectly fixed to the door, and rotates about the pivot shaft in conjunction with opening and closing of the door. And a movable upper hinge part installed on the upper surface of the fixed lower hinge part,
The starting base point formed so that the fixed side lower hinge part side includes a radial line centering on the pivot axis at an arbitrary position on the facing surface of the fixed side lower hinge part and the movable side upper hinge part facing each other While forming a spiral inclined surface with an upward inclination centering on the pivot axis from the center in the forward and rearward opening rotation directions, the movable-side upper hinge part is centered on the pivot axis at an arbitrary position. Forming a downwardly inclined spiral inclined surface centering on the pivot shaft from the starting base portion formed so as to include the radial line to the front and rear opening rotation directions, respectively, and at least the The shape of the spiral inclined surface of the fixed-side lower hinge part substantially matches the shape of the spiral inclined surface of the movable-side upper hinge part,
The fixed lower hinge part has a standing wall surface along the outer peripheral side of the starting base point portion, and has a region including the starting base point portion as a lubricant reservoir, and along the outer peripheral portion of the spiral inclined surface. A hinge device for automatic door closing, wherein a reflux groove for returning the lubricant to the lubricant reservoir is formed.   2. The hinge device for automatic door closing according to claim 1, wherein the starting base point portion is formed linearly along a radial line centering on a pivot shaft.   2. The hinge device for automatic door closing according to claim 1, wherein the starting base point portion is formed in a fan shape with two radial lines centering on a pivot axis at both ends.   In the movable-side upper hinge part, a concave lubricant pocket is formed on the spiral inclined surface adjacent to or close to the starting base point part, and the movable-side upper hinge part rotates as the door is opened. The automatic closing hinge device according to any one of claims 1 to 3, wherein the lubricant staying in the lubricant pocket is scraped up to the spiral inclined surface.   The swing door provided with the hinge apparatus for automatic door closing in any one of the said Claims 1-4 in the any one or both of the upper end of the said door, and a lower end.

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