JP5726456B2 - Closing device and door device provided with the same - Google Patents

Description

  The present invention relates to a door closing device for forcibly and quietly closing a door that opens and closes an entrance and an entrance of a room.

  A configuration example of a conventional door closing device is shown in FIG. The door closing device shown in FIG. 13 includes a device to be captured 7 attached to the upper corner of the door 3 on the side where the door 3 is suspended (door tip) and a capturing device 101 attached to the upper frame member 2A of the door frame 2. The captured device 7 includes a main body 30 fixed to the plate surface of the door 3 and a captured body 31 protruding upward from the distal end portion of the main body 30. The capturing device 101 includes a fixed element 40 fixed to the upper frame member 2A of the door frame 2 and a door arm 102 supported by the fixed element 40 so as to be rotatable in the horizontal direction. The door arm 102 has a guide groove 103 on its lower surface portion that receives and captures the body to be captured 31 when the door 3 is closed. The guide groove 103 extends linearly from the tip of the door arm 102 along the rotational radius direction. After capturing the body to be captured 31, the door arm 102 is rotated toward the door frame 2 to pull the body to be captured 31 toward the door frame 2 while sliding along the guide groove 103. The door can be closed. In the capturing device 101, a buffer mechanism is provided that constantly applies a resistance force to the rotation shaft of the door arm 102 to brake the sudden rotation of the door arm 102. It is done.

Japanese Patent Application No. 2009-256344

  However, in the conventional closing device described above, the door 3 is closed due to the structure in which the body 31 to be captured provided on the side of the door 3 that is to be suspended is captured by the door arm 102 provided on the door frame 2. The braking force by the buffer mechanism of the capturing device 101 cannot be applied to the door 3 until it is just before the end. For this reason, the door 3 rotates without braking until just before the door 3 is closed, and receives the braking force suddenly immediately before the door 3 is slowly guided to the closed state.

  As a method for advancing the timing at which the braking force by the buffering mechanism of the capturing device 101 starts to be effective, it is conceivable to make the entire length of the door arm 102 larger than the conventional one so that the captured object 31 can be captured before the conventional one. . However, increasing the total length of the door arm 102 directly leads to an increase in the size of the capture device 101, and is not a good measure due to restrictions on the installation space of the capture device 101.

  The problem to be solved by the present invention is that a large size of the capturing device is provided for a closing device that can suppress a sudden rotation when the door is closed by causing the braking force of the buffering mechanism of the capturing device to act on the door at an earlier timing than before. An object of the present invention is to provide a door device having such a door closing device.

In order to solve the above-described problems, a door closing device of the present invention has a capturing device attached to a door frame and a captured device attached to a door, and when the door is closed, the closing device in a horizontal direction. The door to be captured is captured by a pivotable door arm, and in that state, the door arm is rotated to the door frame side to draw the captured device, thereby allowing the door to move. A door closing device that leads to a door closing state,
The capture device is
Having a buffer mechanism that suppresses rapid rotation of the door arm toward the direction of closing the door;
The trapped device is:
A support fixedly attached to the plate surface of the door;
The captured object protruding upward from the tip of the support;
Have
The door arm has a guide groove on its lower surface portion that receives and captures the object to be captured as the door is turned in the closing direction.
The guide groove is
A receiving part opened at the tip of the door arm to receive the object to be captured;
A terminal portion where the body to be captured is located when the door is closed;
An intermediate part connecting the receiving part and the terminal part,
The receiving portion is located closer to the door than the end portion in the rotation direction of the door arm.

  Moreover, in order to solve the said subject, the door apparatus of this invention was provided with the door closing apparatus of this invention.

  By configuring as described above, when the device to be captured is not engaged with the door arm, that is, when the door is opened larger than the opening at which the door arm and the device to be captured can be engaged, The arm is held in a standby posture. When the door is closed, the device to be captured approaches the capture device together with the door, and when the opening of the door reaches a predetermined opening, the body to be captured of the device to be captured is received and captured in the guide groove of the door arm. The Thereafter, by rotating the door arm toward the door frame, the body to be captured is drawn toward the door frame while sliding along the guide groove, and the door is forcibly guided to the closed state. At this time, the braking force by the buffer mechanism acts to suppress the rotation of the door arm, thereby preventing the door from moving steeply. As a result, the door is forcibly and quietly closed.

  A guide groove that receives and captures the object to be captured when the door is closed has a receiving portion that opens at the tip of the door arm to receive the object to be captured, a terminal portion where the body to be captured is located when the door is closed, and the receiving An intermediate portion connecting the end portion and the end portion, and the receiving portion is positioned on the door side with respect to the end portion in the rotation direction of the door arm. The captured object can be captured in front of the conventional one without increasing the size.

  In the present invention, the intermediate part is smoothly curved from the terminal end of the receiving part and extends to the terminal part, and the trajectory of the body to be captured along with the intermediate part is caused by the rotation of the door. It is desirable that it is formed so as not to coincide with the trajectory. With this configuration, as the door arm rotates, the object to be captured is drawn toward the door frame while smoothly sliding along the guide groove, and a braking force that prevents the door from rotating sharply is always applied. Can act.

  According to the door device and the door closing device of the present invention, the braking force by the buffering mechanism of the capturing device is applied to the door at a timing earlier than the conventional one without increasing the size of the capturing device, so that the sharp rotation when the door is closed Can be suppressed.

The fragmentary perspective view which shows the form example of the door apparatus provided with the closing device of this invention Partial perspective view of the door device viewed from another direction Partial sectional view showing the part where the capture device of the closing device is attached Exploded perspective view of the trapping device of the closing device Partial front view of door device AA sectional view of FIG. (A) is a top view which shows the state in the capturing device when the door arm of the closing device is in the standby posture. (B) is a plan view showing the state in the capturing device when the door arm of the closing device is in the storage posture. (A) is principal part sectional drawing which looked at the door apparatus just before the door closing operation by the door closing device of this invention is started from the lower part. (B) is the door device immediately before the door closing operation by the conventional door closing device is started downward. Cross-sectional view of the principal part (A) And (B) is a principal part conceptual diagram which shows the intermediate state of the door closing operation | movement by the door closing apparatus of this invention. (A) And (B) is a principal part conceptual diagram which shows the intermediate state of the closing operation by the closing device of a reference example. (A) is sectional view which looked at the door apparatus just before the door closing operation by the door closing apparatus of the present invention is started from below. (B) is the door apparatus after the door closing operation by the door closing apparatus of the present invention is viewed from below. Cross section (A), (B) and (C) are explanatory diagrams of operations performed when the door arm is returned to the standby posture. The fragmentary perspective view which illustrates the door device to which the conventional closing device was attached

Hereinafter, the best mode for carrying out the present invention will be described.
FIG. 1 is a partial perspective view showing an example of an embodiment of a door device provided with the door closing device of the present invention. FIG. 2 is a partial perspective view of the door device of FIG. 1 viewed from another direction.

  The door device 10 includes a door frame 2 provided by being fitted to an opening of a building such as a doorway of a house, and a door 3 provided on the door frame 2 so as to be rotatable in a horizontal direction. The door frame 2 has an upper frame member 2A provided at the upper edge of the opening of the building, and vertical frame members 2L and 2R provided at the left and right side edges of the opening. The door 3 is rotatably connected to one of the two vertical frame members 2 </ b> L and 2 </ b> R (right side in the drawing) via a hinge 5. The vertical frame member 2 </ b> L and the upper frame member 2 </ b> A on the other side (right side in the drawing) of the door frame 2 are provided with door stops 4 </ b> A and 4 </ b> B that contact the edge of the door 3 when the door 3 is closed.

  The closing device 1 includes a capturing device 6 attached to the upper frame member 2 </ b> A and a captured device 7 attached to the door 3. The capturing device 6 is attached in the vicinity of the vertical frame member 2L on the opposite side to the vertical frame member 2R to which the hinge 5 of the upper frame member 2A is attached.

  The to-be-captured device 7 is attached to the vicinity of the end portion (door end side) where the hinge 5 near the upper end of the back surface of the door 3 is not provided, corresponding to the installation position of the capture device 6. The captured device 7 includes a support 30 fixedly attached to the plate surface of the door 3, and a rod-shaped captured body 31 protruding upward from the distal end portion of the support 30. The captured object 31 is elastically supported from below by a coil spring (not shown) built in the support 30.

  The capturing device 6 is fixed to the upper edge portion of the opening of the door frame 2, is supported by the fixing element 40 so as to be rotatable in the horizontal direction, and the captured device 7 is rotated with the rotation of the door 3. The door arm 20 configured to engage and disengage with the door arm 20 and a standby posture to wait for the door arm 20 to engage with the captured device 7 when the captured device 7 is not engaged with the door arm 20 (FIG. 7A) After the captured device 7 is engaged with the door arm 20, an elastic force is applied to the door arm 20 to forcibly rotate the door arm 20 in the direction to close the door 3. When the door arm 20 is rotated in the opposite direction to suppress the rotation when the door arm 20 is rotated in the direction in which the door 3 is closed. A direct acting buffer mechanism 60 for applying a force to the door arm 20 in order to promote movement; The has.

The fixing element 40 has a flat rectangular parallelepiped housing 70 fixed to the door frame 2. Then, the door arm 20, the urging mechanism 50, and the buffer mechanism 60 are housed in the housing 70.
The housing | casing 70 is attached to the space S formed by lacking a part of door stop 4B of the upper frame member 2A. On the upper surface of the housing 70, a protrusion 71e having a shape and size that fits in the groove 2a in which the door stop 4B of the upper frame member 2A is fitted is formed (see FIGS. 4 and 6).
An opening 75 through which the door arm 20 enters and exits is formed at a portion of the housing 70 facing the door 3. At the bottom of the housing 70, a notch 76 is formed for receiving the captured body 31 of the captured apparatus 7 when the door 3 is closed.

  The door arm 20 has an arm main body portion 21 that extends in the radial direction from the center of rotation and protrudes and disappears from the opening 75 of the housing 70. A guide groove 22 is formed on the lower surface side of the arm main body 21. When the door arm 20 is in the standby posture (FIG. 7A), the object to be captured is accompanied by the rotation in the direction in which the door 3 is closed. The distal end portion 31 is configured to be received in the guide groove 22 from the distal end of the door arm 20. The guide groove 22 includes a receiving portion 22a that opens at the tip of the door arm 20 to receive the captured body 31, a terminal end portion 22b where the captured body 31 is located when the door 3 is closed, a receiving portion 22a, and a terminal end portion 22b. And an intermediate portion 22c connecting the two. The receiving portion 22a is located closer to the door 3 than the end portion 22b in the rotation direction of the door arm 20. The receiving part 22a extends in parallel to the rotational radius direction from the front end of the door arm 20, and the intermediate part 22c is smoothly curved from the terminal end of the receiving part 22a and extends to the terminal part 22b.

  Further, the door 3 is closed on the side of the arm main body 21 facing the door 3 even when the door arm 20 is completely accommodated in the housing 70 (the state shown in FIG. 7B). Thus, a guide surface 20a is formed so that the captured object 31 can be guided into the guide groove 22. The guide surface 20a is a smooth concave curved surface curved in an arc shape (see FIG. 4).

  The door arm 20 has a cam portion 14 on which an elastic force by the urging mechanism 50 and a buffering force by the buffering mechanism 60 act. The urging mechanism 50 and the buffer mechanism 60 are provided in series with each other with the cam portion 14 interposed therebetween, and the elastic force by the urging mechanism 50 and the buffer force by the buffer mechanism 60 act in opposite directions from both sides of the cam portion 14. It has a structure to do. The cam portion 14 is provided integrally with the base portion of the arm main body portion 21.

  The urging mechanism 50 includes a first slider 51 that linearly moves back and forth in the longitudinal direction of the housing 70, and a spring 52 that applies an elastic repulsive force to the first cam surface 14 </ b> A of the cam portion 14 via the first slider 51. And have.

  The buffer mechanism 60 includes a second slider 61 that linearly moves back and forth in the longitudinal direction of the housing 70, and a direct acting type that applies a braking force to the second cam surface 14B of the cam portion 14 via the second slider 61. And a damper 62. The damper 62 includes two damper units 62U and 62U arranged in parallel. Each damper unit 62U includes an output shaft 62a and a unit main body 62b that holds the output shaft 62a so as to advance and retract in the axial direction. In the unit main body 62b, a spring (not shown) that urges the output shaft 62a in the extending direction, and a resistance fluid (not shown) such as oil that applies a braking force to the movement of the output shaft 62a in the contracting direction. ) Is housed. The buffer mechanism 60 generates a braking force by being compressed and repelled in the horizontal direction with the rotation of the second cam surface 14B of the cam portion 14 when the door arm 20 is rotated in the direction to close the door 3. To do.

  The door arm 20 is entirely in the housing 70 when the door 3 is closed (see FIG. 11B), and the distal end side of the door arm 20 is the opening 75 of the housing 70 when in the standby posture. To the door 3 side.

  Next, the configuration and operation of the capturing device 6 will be described in more detail with reference to FIGS.

  As described above, the capturing device 6 has the fixing element 40 fixed to the upper frame member 2A of the door frame. The fixing element 40 has a flat rectangular parallelepiped casing 70 fixed to the upper frame member 2 </ b> A of the door frame, and a cover 80 attached to the casing 70.

  The housing 70 has an upper housing member 71 that forms the upper portion and a lower housing member 72 that forms the lower portion. The cover 80 is provided on the outer side of the lower housing member 72. The cover 80 is formed with an opening 78 through which the arm main body 21 enters and exits at a position overlapping the opening 75 of the housing 70. At the bottom of the cover 80, a notch 77 is formed for receiving the body to be captured 31 of the device to be captured 7 when the door 3 is closed.

  First guide slits 71 b and 72 b for guiding the first slider 51 and the second slider 61 are guided to the upper plate portion 71 a of the upper housing member 71 and the lower plate portion 72 a of the lower housing member 72. For fixing the second guide slits 71c and 72c for the shaft, the shaft holes 71d and 72d through which the support shaft 25 for rotatably supporting the door arm 20 is inserted, and the upper and lower housing members 71 and 72. Fastening holes 71g and 72g through which the fastening pin 73 is inserted are formed at positions that communicate with each other in the vertical direction.

  At both left and right ends of the upper casing member 71, end plate portions 71L and 71R formed by bending both end portions of the upper plate portion 71a downward, and side edges of the upper plate portion 71a are formed in an L shape upward. Protrusions 71e and 71e formed by bending are provided. The protrusions 71e and 71e are provided in two places in the left-right direction (the longitudinal direction of the upper frame member 2A). The protrusions 71e and 71e are designed to have a shape and size that fits exactly into the groove 2a (see FIG. 6) in which the door stop 4B of the upper frame member 2A is fitted. The protrusions 71e and 71e are formed with long holes 71f and 71f for appropriately positioning the upper housing member 71 on the upper frame member 2A and fastening them with screws 74, respectively.

  Guide protrusions 51 a and 51 b that are slidably fitted into the first guide slits 71 b and 72 b are formed on the upper and lower surfaces of the first slider 51. A holding hole 51 c into which the distal end portion of the spring 52 is inserted is formed at the proximal end portion of the first slider 51. The spring 52 is provided in a compressed state between the first slider 51 and one end plate portion 71L of the upper housing member 71 (the left side in this example) with the tip portion inserted into the holding hole 51c. It has been. A tip surface 51d orthogonal to the sliding direction of the first slider 51 and an inclined surface 51e inclined about 45 degrees with respect to the tip surface 51d are formed at the tip of the first slider 51. The inclined surface 51e is formed smoothly and continuously from the front end surface 51d on the opening 75 side.

  Guide protrusions 61 a and 61 b that are slidably fitted into the second guide slits 71 c and 72 c are formed on the upper and lower surfaces of the second slider 61. A holding hole (not shown) into which the distal end portion of the output shaft 62 a of the damper 62 is inserted is formed at the proximal end portion of the second slider 61. The damper 62 was compressed between the second slider 61 and one end plate portion 71R of the upper housing member 71 (right side in this example) with the tip end portion of the output shaft 62a inserted into the holding hole. It is provided in the state. An inclined surface 61 e inclined at about 60 degrees with respect to the sliding direction of the second slider 61 is formed at the tip of the second slider 61. The inclined surface 61e of the second slider 61 is inclined in the opposite direction (the direction of opening toward each other) with respect to the inclined surface 51e of the first slider 51.

  The door arm 20 has a shaft hole 23 at the base, and is rotatably connected to a support shaft 25 via a rotary bearing 24 fitted and fixed to the shaft hole 23. The support shaft 25 is provided through the shaft holes 72d and 71d from the lower housing member 72 side after the door arm 20 is disposed between the upper and lower housing members 71 and 72.

  The cam portion 14 of the door arm 20 is sandwiched between a first slider 51 and a second slider 61. The first slider 51 is on the first cam surface 14A, and the second slider is on the second cam surface 14B. 61 is always in pressure contact.

  The cam portion 14 includes plate portions 14U and 14L that are spaced apart from each other in the vertical direction. Both plate portions 14U and 14L are formed with shaft holes 14b and 14b penetrating vertically, and a roller (small rotor) 29 is rotatably supported on a support shaft 26 inserted through the shaft holes 14b and 14b. Has been. The outer peripheral surface of the roller 29 forms the first cam surface 14A. The second cam surface 14B is a portion that extends toward the center of rotation of the door arm 20 while bulging in an arc shape from the portion of the cam portion 14 where the roller 29 is provided to the second cam surface 14B side.

  In addition, a protrusion 27 that defines a maximum rotation range of the door arm 20 toward the door opening side is formed at the base of the door arm 20. When the projection 27 abuts against the side surface of the second slider 61, the rotation of the door arm 20 toward the door opening side is restricted. When the door arm 20 rotates to the open side as much as possible, the first cam surface 14A is engaged with the inclined surface 51e of the first slider 51, and the rotation posture is maintained. FIG. 7A shows the state at this time (standby state).

  When the door arm 20 is rotated toward the closing side from the state of FIG. 7A, the first cam surface 14A moves from the inclined surface 51e of the first slider 51 to the tip surface 51d. The urging mechanism 50 is once compressed when it moves from the inclined surface 51e to the tip surface 51d, but thereafter it is expanded by the elastic force of the spring 52. The first cam surface 14A is pressed by this elastic force, and the door arm 20 is forcibly rotated to the closing side. As the second cam surface 14B rotates at this time, the second slider 61 is pressed and the damper 62 of the buffer mechanism 60 is compressed, so that a drag acts on the door arm 20. By a series of these operations, when the door 3 is closed, that is, after the captured device 7 is engaged with the door arm 20, the door 3 is prevented from turning sharply, and the door 3 is forcibly and quietly closed.

  When the door arm 20 is rotated to the door opening side from the state of FIG. 7B, the tip surface 51d of the first slider 51 is pushed by the first cam surface 14A. This elastic force acts as a force that controls the rotation of the door arm 20 toward the door opening side. On the other hand, since the damper 62 of the buffer mechanism 60 attempts to restore from the compressed state to the extended state, the pressing force by the damper 62 acts on the second cam surface 14B in the direction opposite to the elastic force of the spring 52. As a result, the force by the spring 52 is largely canceled by the force of the damper 62. When the door arm 20 further rotates toward the door opening side, the first cam surface 14A moves from the tip surface 51d of the first slider 51 to the inclined surface 51e. At this time, the first cam surface 14A is locked to the inclined surface 51e of the first slider 51, and the door arm 20 is held in a posture rotated to the maximum on the door opening side. With these series of operations, when the door 3 is opened from the state where the door 3 is completely closed, it is not necessary to apply a large force to the handle of the door 3.

  Next, with reference to FIG. 8 thru | or FIG. 10, the difference in the structure of the guide groove 22 of the door closing apparatus 1 of this embodiment and the guide groove 103 of the conventional door closing apparatus is demonstrated in detail.

  As shown in FIG. 8B, the guide groove 103 of the conventional door closing device is positioned when the door 3 is closed from the receiving portion 103a opened at the tip of the door arm 102 to receive the body 31 to be captured. It extends linearly in parallel to the rotational radius direction to the end portion 103b.

  On the other hand, as shown in FIG. 8A, the guide groove 22 of the door closing device 1 of this embodiment is such that the receiving portion 22a is positioned closer to the door 3 than the end portion 22b in the rotational direction of the door arm 20. . The receiving part 22a and the terminal part 22b are connected by an intermediate part 22c that is smoothly curved.

  As shown in FIGS. 8A and 8B, the full lengths (turning radii) of the door arms 20 and 102 are equal to each other, and the turning angles in the standby posture are also equal to each other. The door arm 20 of the embodiment captures the captured object 31 in front of the conventional door arm 102 shown in FIG. 8B. This is because, in the door closing device 1 of this embodiment shown in FIG. 8A, the receiving portion 22a is located closer to the door 3 than the end portion 22b in the rotational direction of the door arm 20. .

  Further, as shown in FIG. 9, the guide groove 22 of the door closing device 1 of this embodiment is configured such that the trajectory of the captured object 31 along the guide groove 22 extends from the receiving portion 22 a to the end portion 22 b. It is formed so as not to coincide with the locus A (arc) of the body 31 to be captured by movement. With this configuration, the force for forcibly turning the door 3 in the direction to close the door 3 and the steep turning from the time when the door arm 20 captures the body 31 to be closed to the closed state is prevented. The braking force to be applied can always be applied.

  On the other hand, in the reference example shown in FIG. 10, the trajectory of the captured object 31 along the intermediate portion 22 c of the guide groove 22 matches the trajectory A of the captured object 31 due to the rotation of the door 3. While the body 31 is positioned at the intermediate portion 22c, no force can be applied to the body 31 to be captured from the door arm 20.

Next, operation | movement of the door closing apparatus 1 comprised as mentioned above is demonstrated.
When the device to be captured 7 is not engaged with the door arm 20, that is, when the door 3 is opened larger than the opening degree at which the door arm 20 and the device to be captured 7 can be engaged, the door arm 20 is attached. The holding mechanism 50 is held in the standby posture by the elastic force of the biasing mechanism 50. When the door 3 is closed, as shown in FIG. 11A, when the device to be captured 7 approaches the capture device 6 together with the door 3, and the opening degree of the door 3 reaches a predetermined opening degree, The body to be captured 31 of the device 7 is received by the receiving portion 22 a of the guide groove 22 opened at the tip of the door arm 20. Thereafter, when the door 3 is further closed, the door arm 20 starts to rotate from the standby posture to the direction of closing the door 3. At the same time, the elastic force of the urging mechanism 50 starts to act as a force for forcibly turning the door arm 20 in the direction of closing the door 3. As the door arm 20 is forcibly rotated, the body to be captured 31 is drawn toward the door frame 2 while sliding along the guide groove 22 and the door 3 is forcibly closed. At this time, when the braking force of the buffer mechanism 60 of the capturing device 6 is applied, the door 3 is prevented from moving suddenly. Thereby, the door 3 is forcibly and quietly closed.

  On the other hand, as shown in FIG. 11B, when the door 3 is opened from the state in which the door 3 is completely closed, the door arm 20 is rotated in a direction in which the door 3 is in the standby posture as the door 3 opens. start. At the same time, the repulsive force of the buffer mechanism 60 starts to act as a force that rotates the door arm 20 in the direction of opening the door 3, and the rotation of the door arm 20 in the direction of opening the door 3 is promoted. As a result, when the door 3 is manually opened, a large force is not applied to the handle of the door 3. Since the direct acting damper 62 is used as the buffer mechanism 60, the door closing device 1 can close the door 3 gently when closing the door and can open the door 3 with a weak force when opening the door. Can be realized without increasing the size of the capturing device 6.

  Even when the door 3 is not closed, even if the door arm 20 is housed in the housing 70 for some reason (the state shown in FIG. 7B), the door 3 Is closed and then opened, the door arm 20 can be returned to the standby state (the state shown in FIG. 7A). FIG. 12 shows the operation at this time. When the door 3 is closed from the state of FIG. 12A, the tip 31a of the body to be captured 31 is guided downward along the guide surface 20a, and the body to be captured 31 is pushed down accordingly. Then, as shown in FIG. 12 (B), the tip 31a of the body 31 to be captured passes through the guide surface 20a and reaches the lower end of the arm main body 21, and as shown in FIG. 12 (C). The body 31 is engaged with the guide groove 22. By opening the door 3 in this state, the door arm 20 can be returned to the standby state.

  As described above, according to the configuration of this embodiment, the receiving portion 22a of the guide groove 22 is positioned closer to the door 3 than the end portion 22b in the rotational direction of the door arm 20, and thus the door arm 20 The captured object 31 can be captured before the conventional one without increasing the total length of the conventional one. And the receiving part 22a is extended in parallel with respect to the rotation radial direction from the front-end | tip of the door arm 20, and the intermediate part 22c is curving smoothly from the terminal end of the receiving part 22a, and is extended to the terminal part 22b, The to-be-captured body 31 can be smoothly slid along the guide groove 22 and pulled toward the door frame 2 to smoothly guide the door 3 to the closed state. Further, since the trajectory of the body to be captured 31 along the guide groove 22 is formed so as not to coincide with the trajectory A of the body to be captured 31 due to the rotation of the door 3, the door 3 is forced to rotate in a direction to close it. The force to be moved and the braking force to prevent steep rotation can always be applied.

  Further, the door arm 20, the urging mechanism 50, and the buffer mechanism 60 are accommodated in a flat rectangular parallelepiped casing 70 fixed to the upper frame member 2 </ b> A of the door frame 2, and face the door 3 of the casing 70. By providing an opening 75 through which the door arm 20 enters and exits in the portion, the fixed element 40 fixed to the door frame 2 is miniaturized, and in terms of appearance, a simple external form in which only the door arm 20 is used as a movable part. The door closing device 1 can be realized.

  In addition, the capturing device 6 is attached to the end (door side) opposite to the side (hanging side) to which the hinge 5 of the upper frame member 2A constituting the door frame 2 is attached. When the door 3 is opened, the repulsive force (restoring force) of the buffer mechanism 60 can be used as effectively as the force for promoting the opening of the door 3. Therefore, even if the repulsive force (restoring force) of the buffer mechanism 60 is weak, an effect of assisting the opening of the door 3 when the door 3 is opened can be obtained.

  Moreover, the cam part 14 for making the elastic force by the urging | biasing mechanism 50 and the buffering force by the buffer mechanism 60 act on the door arm 20 is integrated with the door arm 20, Therefore A number of parts can be reduced. By reducing the number of parts housed in the housing 70, the housing 70 can be downsized. In addition, since the biasing mechanism 50 and the buffer mechanism 60 are arranged in series with each other with the cam portion 14 in between, the width dimension and the height dimension in the short direction of the casing 70 can be reduced. Is very advantageous in attaching the capture device 6 to the limited and limited door frame 2. As a result of reducing the width dimension and the height dimension of the casing 70 in the short dimension direction, the casing 70 is provided on the lower surface portion of the upper frame member 2A by using the installation space S of the door stop 4B provided on the upper frame member 2A. Can be attached. Since the projection 71e provided on the upper surface portion of the housing 70 is just fitted in the groove 2a in which the door stop 4B of the upper frame member 2A is fitted, the mounting accuracy of the housing 70 with respect to the upper frame member 2A is increased. be able to.

  In addition, although the example which applied the door closing apparatus of this invention to the left opening type door was shown in the said embodiment, it cannot be overemphasized that it can apply effectively also to a right opening type door.

DESCRIPTION OF SYMBOLS 1 Door closing apparatus 2 Door frame 3 Door 6 Capture apparatus 7 Captured apparatus 20 Door arm 22 Guide groove 22a Receiving part 22b Termination part 22c Intermediate part 31 Captured object 60 Buffer mechanism

Claims (3)

When the capture device (6) attached to the door frame (2) and the captured device (7) attached in the vicinity of the end of the door (3) on the door end side , the door (3) is closed. The captured body (31) of the captured apparatus (7) is captured by a door arm (20) provided in the capturing apparatus (6) so as to be rotatable in a horizontal direction, and the door arm (20) is captured in that state. ) To the door frame (2) side and pulling the trapped device (7) to bring the door (3) into a closed state (1),
The capture device (6)
A buffer mechanism (60) that suppresses sudden rotation of the door arm (20) in the direction of closing the door (3);
The trapped device (7)
A support (30) fixedly attached to the plate surface of the door (3);
The captured object (31) protruding upward from the tip of the support (30);
Have
The door arm (20)
It is rotatable with the position on the suspending side of the door (3) as a support shaft from the captured body (31), and
A guide groove (22) that receives and captures the object to be captured (31) as the door (3) rotates in a closing direction has a lower surface portion thereof.
The guide groove (22)
A receiving portion (22a) opened at the tip of the door arm (20) to receive the captured object (31);
An end portion (22b) where the body (31) to be captured is located when the door (3) is closed;
An intermediate part (22c) connecting the receiving part (22a) and the terminal part (22b);
The receiving portion (22a) is located closer to the door (3) than the end portion (22b) in the rotational direction of the door arm (20) ,
The intermediate portion (22c) is smoothly curved from the end of the receiving portion (22a) and extends to the end portion (22b), and the trajectory of the captured body (31) along this extends the door. The door closing device formed so as not to coincide with the locus of the body (31) to be captured by the rotation of (3) . The said closing part (22a) is a door closing apparatus of Claim 1 extended in parallel with respect to the rotation radial direction of the said door arm (20) .   A door device comprising the door closing device according to claim 1.

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