CN216893959U - Door closing auxiliary device - Google Patents

Abstract

The invention provides a door closing auxiliary device, comprising a pull-in arm 3, which is provided with openings at the front end and the rear end and is provided with an engaging groove 3a engaged with a trigger shaft 33 of a trigger and an auxiliary groove 3b continuously formed at the rear end opening of the engaging groove 3 a. Even if the pull-in arm 3 is out of order at the holding position when the door is opened, the trigger shaft 33 enters the auxiliary groove 3b of the pull-in arm 3 as the door is closed, and then the slide piece 11 closing the rear end opening of the engagement groove 3a slides and enters the engagement groove 3a, so that the door can be normally closed, and the trigger shaft 33 can be stably engaged with the engagement groove 3a even if the engagement amount of the trigger shaft 33 in the engagement groove 3a is small.

Description

Door closing auxiliary device

Technical Field

The invention relates to a door closing auxiliary device, in particular to a door closing auxiliary device which closes an indoor revolving door or a device with a pulling back and damping function of a hinged door, and assists the closing operation of the door by pulling the door into a door frame.

Background

In recent years, door closers are installed on revolving doors or hinged doors in buildings and rooms, so that the opened doors can be slowly and automatically closed. In a generally known door closer, an upper frame of a door frame and an upper end of a door are connected by a connecting arm, and an opening and closing operation of the door is controlled by a spring and a hydraulic pressure. However, when such a door closer is installed, the door tends to feel heavy when opening and closing, and the hinge supporting the door is constantly loaded, which may cause problems such as abnormal noise generated at the hinge connection portion or damage of the hinge when opening and closing the door.

In view of this, patent document 1 and the like propose a door closing assist device including a device main body connected to one of a door frame and a door rotatably provided with respect to the door frame; and a trigger connected to the other of the door frame and the door, wherein when the door is closed, a pull-in arm of the apparatus body engaged with the trigger is rotated in the process, thereby pulling the door to the door frame.

Specifically, such a door closing assist device is often configured such that a retraction arm of a device body is rotatably supported by a body case of the device body between a standby position corresponding to a door open state and a retraction position corresponding to a door closed state, and when the door is open and the retraction arm is not engaged with a trigger, the retraction arm is held at the standby position by a pressing force from a pressing mechanism received by the retraction arm; when the door is closed, the trigger engaged with the pull-in arm is released from the holding state at the standby position of the pull-in arm in the process, the pressing mechanism presses the pull-in arm to rotate to the pull-in position, the pull-in arm is braked and rotated by the braking mechanism in the state of being engaged with the trigger, and then the door is pulled to the doorframe.

Unlike the door closer, the door closing assistance device of the above-described structure does not have a connecting arm for connecting the door frame and the door, and controls the movement of the door only in a region near the closed door position. Therefore, if the opened door is manually closed to a certain degree, the door can be automatically closed slowly as if it is acted on by a conventional door closer, and the opening and closing of the door can be relatively light because the opening and closing movement of the entire door is not controlled. In this case, since the load applied to the hinge is small, there is little possibility that an abnormal noise occurs or the hinge is damaged when the door is opened or closed.

Patent document 1: japanese patent laid-open publication No. 2010-95979

However, in the door closing assist device of patent document 1, the pull-in arm of the device body attached to the door frame is normally held at the standby position when the door is opened, but the door can be normally closed even if the pull-in arm is erroneously held at the standby position by an external force.

That is, the lower surface side of the pull-in arm is provided with an engaging groove into which a trigger shaft (engaging member) of the trigger enters and engages at the time of normal operation, and an auxiliary groove having one end beside the engaging groove and the other end in an open state. Meanwhile, even in an abnormal state in which the trigger shaft is held in a state of protruding from the upper surface of the arm portion of the trigger by the pressing mechanism and the pull-in arm is in the pull-in position despite the door being opened, when the door is once closed, the trigger shaft of the trigger attached to the door enters the auxiliary groove of the pull-in arm, and then the trigger shaft retreats into the pull-in arm against the pressing force from the pressing mechanism, and then passes through between the auxiliary groove and the engagement groove to enter the engagement groove, and the door is closed as usual.

However, as described above, the trigger shaft protruding from the upper surface of the arm portion of the trigger is engaged with the engagement groove on the lower side of the pull-in arm by the pressing mechanism, and the engagement between the pull-in arm and the trigger is unstable, and the normal operation may not be performed.

That is, the hinged door is often inclined so that the side opposite to the hinge is lower than the hinge side during use, and thus the length of the trigger shaft entering the engaging groove of the pull-in arm becomes small. Therefore, when the door is opened quickly from a closed state, the trigger shaft that is in contact with the side wall of the engagement groove is inclined, and the downward component of the force acting on the trigger shaft exceeds the pressing force of the pressing mechanism before the retraction arm reaches the standby position, so that the trigger shaft may fall out of the engagement groove. If the trigger shaft falls out of the engagement groove before the retraction arm is pulled out to the standby position, the retraction arm returns to the retraction position by the pressing mechanism, and the door closing assist operation cannot be performed next time the door is closed.

Therefore, an object of the present invention is to provide a door closing assist device that can easily cope with a situation in which an abnormality occurs in a holding position of a pull-in arm when a door is opened, and can stably maintain a door closing assist function. The door closing assisting device performs an assisting operation of closing the door by engaging a pull-in arm of a device body, which is connected to one of the door frame and the swing door, with a trigger, which is connected to the other of the door frame and the swing door.

Disclosure of Invention

In order to solve the above problem, the present invention provides a door closing assisting device including: a device main body connected to one of a door frame and a door rotatably provided with the door frame; a trigger connected to the other of the door frame and the door, the apparatus main body including: the main body box body is rectangular; a pull-in arm that is engageable with the trigger and is rotatably supported in the main body case between a standby position corresponding to a door-open state and a pull-in position corresponding to a door-closed state; a pressing mechanism that presses the pull-in arm on a rotation plane of the pull-in arm; a brake mechanism that brakes rotation of a pull-in arm from a standby position to a pull-in position, wherein the pull-in arm is held in the standby position by a pressing force from the pressing mechanism when the pull-in arm of the apparatus main body is not engaged with the trigger when the door is in an open state, and wherein a trigger engaged with the pull-in arm releases the holding of the pull-in arm in the standby position during closing of the door, so that the pressing mechanism presses the pull-in arm in a direction to rotate the pull-in arm to the pull-in position, and wherein the pull-in arm is rotated while being braked by the brake mechanism in a state in which the pull-in arm is engaged with the trigger, so that the door is pulled onto a door frame, wherein the pull-in arm has a front end and a rear end both open and has an engagement groove for engaging with an engagement member provided on the trigger, and wherein the pull-in arm comprises: an arm body having a rear end rotatably supported by the body case, a slider having an opening at a rear end of the engagement groove slidably fitted to the arm body in an opening/closing direction, and a slider compression spring for pressing the slider in a direction for closing the opening at the rear end of the engagement groove, wherein when the door is opened and the pull-in arm is in a normal state of the standby position, the engagement member of the trigger enters the engagement groove of the pull-in arm from the opening at the front end of the pull-in arm with the door closed, and when the door is opened and the pull-in arm is in an abnormal state of the pull-in position, the engagement member of the trigger comes into contact with the slider of the pull-in arm with the door closed, and then the slider is slid in a direction for opening the opening at the rear end of the engagement groove against a pressing force of the compression spring, thereby entering the engaging groove.

According to the above configuration, even when the pull-in arm is in an abnormal state at the pull-in position when the door is opened, the engagement member of the trigger slides the slide piece closing the opening portion at the rear end of the engagement groove of the pull-in arm into the engagement groove as the door is closed, so that the door can be normally closed. Further, since the engaging member of the trigger does not recede unlike the case of being pressed upward, it can be stably engaged with the retraction arm even if the amount of engagement in the engaging groove is small. Therefore, when the door is opened from the closed state of the door, the engaging member does not come out of the engaging groove, and the pull-in arm can be surely rotated to the standby position, so that the door closing assist function can be stably maintained.

In this case, the slider of the pull-in arm may have an inclined surface inclined with respect to the pressing direction of the slider pressing spring on the side facing the door, and may slide in a direction to open the rear end opening of the engagement groove as the engagement member of the trigger is pressed along the inclined surface.

Further, if the engaging groove of the pull-in arm is formed by assembling the slider to the arm main body, the structure of the pull-in arm can be simplified.

As described above, the door closing assist device according to the present invention is configured such that the retraction arm is in an abnormal state at the retraction position when the door is opened, the trigger is engaged with the retraction arm as the door is closed, and the door can be normally closed, and the trigger is engaged with the retraction arm in a stable state when the door is opened, and the retraction arm is accurately rotated to the standby position even if the door is used for a long time.

Drawings

Fig. 1 is a perspective view schematically showing a state where a door closing assisting device according to the present embodiment is installed

FIG. 2 is a cross-sectional plan view showing the door closing assisting device in FIG. 1 (in a state during door closing)

FIG. 3 is an exploded perspective view showing the device body in FIG. 1

FIG. 4(a) is a perspective view showing the state where the pull-in arm in FIG. 3 is assembled, and (b) is a sectional view taken along the line IV-IV in (a)

FIG. 5 is a cross-sectional plan view showing an enlarged main part of the apparatus main body in FIG. 2

FIG. 6 is a cross-sectional plan view showing a state where the pull-in arm is rotated in a direction corresponding to the pull-in direction in FIG. 5

FIG. 7 is a cross-sectional plan view showing a state of the door closing assisting device at the time of door closing corresponding to FIG. 2

FIG. 8 is a cross-sectional plan view for explaining a method of adjusting the urging force of the arm pressure spring in FIG. 2

FIG. 9 is a perspective view showing, from below to above, the urging force adjusting operation of the arm pressing spring shown in FIG. 8

FIGS. 10(a) and (b) are explanatory views each showing an operation when the door is closed when the pull-in arm is in the pull-in position

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings.

As shown in fig. 1, the door closing assisting device of the present embodiment is mounted on a hinged door D for opening and closing a door opening of a room of a house, and is composed of a device body 1 mounted on an upper rail of a door frame F provided in a door opening, and a trigger 31 mounted on an upper end of the door D rotatably provided on one stile of the door frame F through a hinge (not shown). The door frame F is provided at an upper corner opposite to the hinge with a portion having no door stopper S, on which the apparatus body 1 is mounted. In the following description, the side of the other mullion of the main body of the apparatus 1, which faces the doorframe F, is referred to as one end side, and the opposite side is referred to as the other end side.

As shown in fig. 2 and 3, the apparatus main body 1 includes: a main body case 2 which is rectangular and is composed of an upper case 2a and a lower case 2b made of metal; a pull-in arm 3 which is engageable with a trigger 31a described later and is rotatably supported in the main body casing 2; a pressing mechanism 4 that presses the pull-in arm 3 on a rotation plane of the pull-in arm 3; and a brake mechanism 5 for braking the rotation of the pull-in arm 3.

The main body casing 2 is formed by incorporating the pull-in arm 3, the pressing mechanism 4, and the brake mechanism 5 in the upper casing 2a and the lower casing 2b and then joining them together by a plurality of casing fixing screws 6. Then, the main body casing 2 is attached to the lower surface of the upper frame of the door frame F by a plurality of casing fixing screws 7 (omitted in fig. 3) penetrating the entire casing in such a manner that the longitudinal direction thereof is parallel to the upper frame of the door frame F, and the pull-in arm 3 is inserted and removed from the opening of the front side (the surface facing the closed door D). A case fixing screw 6 is screwed into a cylindrical case grommet 8 fixed to the lower case 2b from the upper side of the upper case 2a, and a case mounting screw 7 is screwed into the upper stile of the door frame F in a state of passing through a cylindrical mounting screw grommet 9 disposed between the upper case 2a and the lower case 2 b. In addition, a groove having the same shape as the front opening is formed in the lower surface of the main body housing 2, and therefore, when the door D is closed, as described below, the pull-in arm 3 can pull a part of the trigger 31 down to the lower portion of the main body housing 2 without interfering with the main body housing 2.

As shown in fig. 4(a) and 4(b), the pull-in arm 3 includes: an arm 10 whose rear end is rotatably supported by the main body case 2 and whose front end is engaged with the trigger 31; a slider 11 which is triangular in plan view and is assembled to the tip of the arm 10; and a slider compression spring 12 for pressing the slider 11 toward the rear end of the arm 10. The arm body 10 and the slider 11 are made of resin.

The arm 10 has a slide guide portion 10a at the tip thereof, which is a flat plate shape having a trapezoidal shape in plan view on one side in the width direction of the arm 10 and guides the slider 11 to move along the arm 10. The vane guide portion 10a has a spring housing 10b that extends in the longitudinal direction of the arm 10 and houses the vane pressure spring 12.

The slider 11 includes: a slit 11a which is triangular in plan view, is located at the center position in the vertical direction of the slider 11, has openings in the side surface facing the center in the width direction of the arm 10 and the side surface facing the rear end of the arm 10, and has a part of the slide guide portion 10a inserted therein; a spring holding hole 11b extending from a side (slit closing surface) facing the front end of the arm body 10 to a position overlapping with the spring housing 10 b. When the slider 11 is assembled to the arm body 10, the slide pressure spring 12 is placed in the spring case 10b of the arm body 10, and the slider 11 is inserted from a position where the slit 11a on the side surface of the arm body 10 faces the slide guide portion 10a to a position where the spring holding hole 11b accommodates the slide pressure spring 12. It is necessary to push the slider 11 from a position where the slit 11a faces the slide guide portion 10a on the arm body 10 side while elastically deforming it until the spring holding hole 11b sandwiches the slide pressing spring 12.

The slider 11 assembled to the arm 10 is pressed against the bottom surface of the spring holding hole 11b by the slider pressing spring 12 to be pressed toward the rear end of the arm 10, and the wall of the slit closing surface is brought into contact with the slider guide 10a to be restricted from moving toward the rear end of the arm 10. Therefore, when the slider 11 is subjected to a force in a direction to compress the vane pressure spring 12, it slides toward the tip of the arm 10 under the guidance of the vane pressure spring 12 and the vane guide portion 10a (see fig. 10(a) and 10 (b)).

By the attachment of the slider 11, the pull-in arm 3 is formed with a linear engagement groove 3a for engagement with a trigger 31, which will be described later, and an auxiliary groove 3b formed continuously with the engagement groove 3a at the bottom of the tip of the arm body 10. The engagement groove 3a has one end opened to the front end of the pull-in arm, and an auxiliary groove 3b formed continuously to the opening of the other end (the rear end of the pull-in arm 3) opened to the front of the pull-in arm 3. The slide piece 11 is slidable in a direction to close the rear end opening of the engagement groove 3 a. The vane pressure spring 12 presses the vane 11 in a direction to close the rear end opening portion of the engagement groove 3 a.

On the other hand, the rear ends of the arm bodies 10 are respectively provided with: a pair of rotation shaft portions 10c rotatably inserted into the rotation shaft holes 2c of the main body casing 2; and a pair of pressure receiving portions 10d supporting both end portions of the pressure receiving pin 13 arranged in the vertical direction; and a pair of connecting portions 10e that support both end portions of the connecting pin 14 that are similarly arranged in the vertical direction.

The rotation of the arm body 10 about the rotation shaft 10c is regulated by a baffle 2D protruding inward from the upper and lower surfaces of the main body casing 2 and a casing pad 8 near one end (left end in fig. 2) of the main body casing 2, so that the draw-in arm 3 can be rotated between a standby position corresponding to an opened state of the door D and a draw-in position corresponding to a closed state of the door D. Further, the baffle 2d is designed to contact the same side as the front end extending a long distance with respect to the rotation center of the arm body 10 to prevent the arm body 10 from bending. An annular groove is formed around the rotating shaft portion 10c, an inward annular projection formed by deburring the outer peripheral edge of the rotating shaft hole 2c is fitted into the annular groove, and a lubricant not shown is retained, so that the pull-in arm 3 can be rotated stably.

The pressure receiving portion 10d of the arm 10 receives the pressing force from the pressing mechanism 4 via the pressure receiving pin 13 and the pressure receiving roller 15 slidably fitted to the axial center portion of the pressure receiving pin 13. The connection portion 10e is connected to the brake mechanism 5 via a connection pin 14 and a bar-shaped connection member 16 having a hole formed at one end thereof for passing the axial center portion of the connection pin 14 therethrough.

The urging mechanism 4 is provided with an arm pressure spring 17 (generating urging force in the longitudinal direction) arranged in the longitudinal direction of the main body casing 2, a first spring case 18 and a second spring case 19 sandwiching both ends of the arm pressure spring 17, respectively, and a cam member 20 contacting the second spring case 19 is provided on the other side of the arm pressure spring 17. The arm pressure spring 17 presses the pressure receiving roller 15 connected to the pull-in arm 3 via the first spring case 18, thereby causing the pull-in arm 3 to rotate in its plane of rotation.

In the first spring housing 18, one end of the arm pressure spring 17 is inserted into a spring insertion hole 18a provided on a surface facing one side of the second spring housing 19, and a pressing surface 18b provided on the other side of the first spring housing 18 is in contact with the pressure receiving roller 15 of the draw-in arm 3. On the other hand, in the second spring case 19, the other end of the arm pressing spring 17 is inserted into a spring insertion hole 19a provided on a surface facing one side of the first spring case 18, and an inclined cam surface 19b provided on the other side of the second spring case 19 is in contact with the cam member 20. The inclined cam surface 19b of the second spring case 19 is formed to be inclined with respect to the longitudinal direction of the main body case 2 in a plan view. Further, strip-shaped projections 18c, 19c formed on the upper and lower surfaces of the two spring cases 18, 19, respectively, are slidably fitted into upper and lower guide grooves 2e1, 2e2, respectively, extending in the longitudinal direction of the main body case 2.

The cam member 20 has inclined cam surfaces 20a which are in parallel sliding contact with the inclined cam surfaces 19b of the second spring case 19, and rectangular plate-like projections 20b formed on the upper and lower surfaces thereof are slidably fitted into upper and lower guide grooves 2f extending in the width direction of the main body case 2, respectively. Then, a spring adjustment screw 21 penetrating the cam member 20 in the front-rear direction thereof (the width direction of the main body case 2) is screwed with an adjustment nut 22, and the adjustment nut 22 is non-rotatably housed in a hollow portion opened on the side surface opposite to the inclined cam surface 20a of the cam member 20. The spring adjusting screw 21 is installed in the main body casing 2, has its front end in contact with the outer circumferential surface of the above-mentioned cushion cover 9 for mounting the screw, which is disposed near the other end of the apparatus main body 1, has its head portion passing through the short side portion of the screw seat 23 having an L shape in plan view, and is rotatable from the outside in the width direction of the main body casing 2 through a hole opened on the front surface of the main body casing 2.

The brake mechanism 5 includes a direct-acting damper 24 disposed along the longitudinal direction of the main body case 2, a damper bracket 25 for fixing a cylindrical portion 24a of the damper 24 in the axial direction, a U-shaped damper cover 26 engaged with an end portion of a shaft 24b of the damper 24, and a damper spring 27 disposed between the bottom portion of the cylindrical portion 24a of the damper 24 and the damper bracket 25. The damper 24 controls the rotation of the pull-in arm 3 via the damper cover 26 and the connecting piece 16. The damper 24 has its shaft portion 24b adjusted to have substantially the same resistance when retracting into the cylindrical portion 24a and the resistance when extending out of the cylindrical portion 24 a.

The damper bracket 25 includes a base end portion 25a through which the pad cover 9 for mounting the screw is inserted, and upper and lower arm portions 25b extending from the base end portion 25a in parallel with the damper 24, and the upper and lower arm portions 25b sandwich the tube portion 24a of the damper 24. The base end portion 25a is bored with a hole in a side wall opposite to the cam member 20 so that the front end of the spring adjusting screw 21 is in contact with the mat cover 9 for mounting the screw. The entire damper bracket 25 is positioned by fitting the projections 25c formed on the upper surface of the upper arm 25b and the lower surface of the lower arm 25b into the positioning holes 2g of the main body housing 2.

The damper cover 26 has an engagement hole 26a into which the tip end of the shaft 24b of the damper 24 is inserted. A plurality of protrusions 26b formed on the upper and lower surfaces of the damper cover 26 are slidably fitted into upper and lower guide grooves 2h extending in the longitudinal direction of the main body case 2, respectively. Then, the connecting pin 28 is passed through the upper and lower arms of the U-shaped portion, and the axially central portion of the connecting pin 28 is passed through the hole at the other end of the connecting member 16, thereby connecting the damper cover 26 with the pull-in arm 3. Both ends of the connecting pin 28 protruding from between the upper and lower surface protrusions 26b of the damper cover 26 are formed in a small diameter so as to be fitted into the guide grooves 2h on the main body case 2.

The device body 1 of the door closing assisting device has the above-described structure, and as shown in fig. 1 and 2, the body case 2 is attached to the upper rail of the door frame F such that one end surface thereof faces the upper end of the other vertical rail of the door frame F with a slight gap therebetween, and the pull-in arm 3 moves in and out toward the door D.

On the other hand, as shown in fig. 1 and 2, the trigger 31 includes a cover 32 and a trigger shaft 33 extending from the upper surface of the cover 32, and the trigger 31 is attached to the upper end portion of the door D on the side away from the hinge so that the trigger shaft 33 engages with an engagement groove 3a formed in the draw-in arm 3 of the apparatus main body 1 when the door D is in a region close to its closed position.

Next, the operation of the door closing assist device will be described. First, as shown in fig. 1, when the door D is opened and the pull-in arm 3 of the apparatus main body 1 is not engaged with the trigger 31, the pull-in arm 3 is held at the standby position (a state pulled out from the main body casing 2). The pull-in arm 3 is held at the standby position because, as shown in fig. 5, the pressure receiving roller 15 of the pull-in arm 3 and the pressing surface 18b of the first spring case 18 of the pressing mechanism 4 are in contact on the upper side of a straight line (a straight line extending from the rotation center O parallel to the pressing direction of the arm pressure spring 17) a which is a set of equilibrium points of the pressing mechanism 4 with respect to the rotation center O of the pull-in arm 3. The pull-in arm 3 receives a moment in the counterclockwise direction by the urging force from the urging mechanism 4, and the counterclockwise rotation is restricted by the flapper 2d of the main body case 2 (see fig. 2).

Then, when the opened door D is rotated in the closing direction, as shown in fig. 2, the trigger shaft 33 of the trigger 31 comes into contact with the tip end of the pull-in arm 3 of the apparatus body 1 (a part of the trigger shaft 33 enters the linear portion of the engaging groove 3 a) in this process. At this time, the retraction arm 3 is slightly rotated clockwise with the tip end thereof being pressed by the trigger shaft 33, and the contact point of the pressure roller 15 of the retraction arm 3 and the first spring housing 18 of the pressing mechanism 4 exceeds the equilibrium point (straight line a) of the pressing mechanism 4.

Then, the holding of the pull-in arm 3 at the standby position is released, and as shown in fig. 6, the first spring box 18 is moved toward the one end side of the apparatus body 1 by the urging force of the arm pressing spring 17 of the pressing mechanism 4, and the pull-in arm 3 is rotated clockwise (pull-in direction). Then, the trigger shaft 33 is moved (pulled) toward the rear side of the linear portion thereof with respect to the engaging groove 3a of the pull-in arm 3, and the door D automatically rotates about the hinge together with the trigger 31 and is pulled into the door frame F. Thereafter, as shown in fig. 7, the draw-in arm 3 comes into contact with the case back 8 at the draw-in position in the main body case 2 and stops, and the door D also stops at the closed position.

At this time, the rotation of the pull-in arm 3 from the standby position to the pull-in position is braked by the action of the brake mechanism 5 connected to the connecting portion 10e of the pull-in arm 3. That is, when the pull-in arm 3 rotates clockwise from the standby position, the connecting portion 10e of the pull-in arm 3 presses the damper cover 26 of the brake mechanism 5 and the shaft portion 24b of the damper 24 via the connecting pin 14 and the connecting link 16, and the rotation of the pull-in arm 3 is decelerated by the resistance of the damper 24 against the shaft portion 24b being retracted into the cylindrical portion 24 a. Therefore, even if a strong force is applied to the door D in the closing direction by hand or the like, the door D is slowly closed, and no impact sound is generated when contacting the door stopper S of the door frame F.

In addition, in this door closing assist device, even when the force applied to the door D in the door closing direction is small, the pull-in arm 3 can be surely rotated in the pull-in direction when the trigger shaft 33 comes into contact with the tip end of the pull-in arm 3 due to the following principle.

That is, as shown in fig. 5, the pressing surface 18b of the first spring box 18, which is a contact portion of the pressing mechanism 4 with the pull-in arm 3, is composed of an arm holding surface 18b1 orthogonal to the pressing direction of the pressing mechanism 4 and an inclined surface 18b2 continuous with the arm holding surface 18b1 and inclined away from the rotation center O of the pull-in arm 3. The arm holding surface 18b1 is in contact with the pressure receiving roller 15 of the pull-in arm 3 in the standby state, and the equilibrium point (straight line a) of the pressing mechanism 4 is located on the inclined surface 18b2 at a position close to the arm holding surface 18b 1. Therefore, when the trigger 31 contacts the pull-in arm 3 in the standby position and slightly rotates the pull-in arm 3 during the closing of the door D, the pressure receiving roller 15 immediately contacts the inclined surface 18b2 of the first spring case 18, and the resistance to the rotation of the pull-in arm 3 is reduced. In this way, the contact point between the pressure receiving roller 15 and the first spring box 18 more easily crosses the equilibrium point (straight line a) than the case where the contact surface of the pressing mechanism with the pull-in arm is formed only by the surface orthogonal to the pressing direction.

In the brake mechanism 5 for braking the rotation of the pull-in arm 3, since a space is provided on the right side of the cylindrical portion 24a of the damper 24 and the damper spring 27 is provided in the space, the braking action of the damper 24 hardly occurs at the start of the rotation of the pull-in arm 3 in the pull-in direction, and the axial movement of the damper cover 26 and the damper 24 pushed by the connecting portion 10e of the pull-in arm 3 is damped and braked by the damper spring 27, thereby reducing the rotation resistance of the pull-in arm 3.

Therefore, even if a force that causes the trigger shaft 33 to slightly contact the pull-in arm 3 is applied to the opened door D, the state in which the pull-in arm 3 is held at the standby position is released, and smooth closing of the door D can be ensured by rotation of the pull-in arm 3 in the pull-in direction.

Then, as shown in fig. 7, when the door D in the closed state is opened, the operation is reversed from the operation in the closed state described above. That is, when the closed door D is rotated in the opening direction, the trigger shaft 33 moves along the engagement groove 3a of the pull-in arm 3 toward the tip side of the linear portion, and rotates the pull-in arm 3 counterclockwise. Thereafter, the pull-in arm 3 is brought into contact with the flapper 2d at the standby position and stopped, and is held by the pressing mechanism 4 in this state. When the pull-in arm 3 is stopped, the trigger shaft 33 is disengaged from the engagement groove 3a of the pull-in arm 3, and the door D is rotated independently of the pull-in arm 3 to open the door.

In the present embodiment, as shown in fig. 8 and 9, in the case where the apparatus main body 1 is mounted on the door frame F, the spring adjusting screw 21 of the urging mechanism 4 can be turned by a manual screwdriver H through a hole on the front surface side of the main body casing 2 to adjust the urging force of the urging mechanism 4 (the arrow in fig. 8 indicates an adjusting operation in a direction to increase the urging force).

In other words, the spring adjusting screw 21 is immovably fixed in the axial direction by the front wall of the main body casing 2 and the grommet 9 for mounting the screw, and the adjusting nut 22 screwed with the spring adjusting screw 21 is housed in the cam member 20 so as not to be rotatable. Therefore, when the spring adjustment screw 21 is rotated, the adjustment nut 22 moves in the axial direction of the spring adjustment screw 21 (the width direction of the main body case 2) together with the cam member 20. At the same time, the second spring case 19 having the inclined cam surface 19b in sliding contact with the inclined cam surface 20a of the cam member 20 moves in the longitudinal direction of the main body case 2. Therefore, the compression amount of the arm pressure spring 17 is changed, and the pressing force of the pressing mechanism 4 is adjusted.

Accordingly, as described above, the pressing force of the pressing mechanism 4 is adjusted by the operation of rotating the spring adjustment screw 21, and the closing operation of the door D is accurately assisted without being affected by the weight of the door D, and the door D does not feel heavy when opened.

In this door closing assisting device, since the spring adjustment screw 21 is provided in a state of extending in the width direction of the elongated main body casing 2, and the turning operation thereof can be performed from the front side of the door frame F when the door D is opened, the adjustment of the pressing force can be performed more easily than the turning operation of the spring adjustment screw extending in the longitudinal direction of the main body casing from the direction parallel to the door frame stile.

In this door closing assist device, the pull-in arm 3 is normally held at the standby position when the door D is opened, but even if the pull-in arm 3 is accidentally subjected to some force and is rotationally held at the pull-in position, the door D can be normally closed as described below.

That is, when the door D is opened and the pull-in arm 3 is at the pull-in position and the door D is closed, the trigger shaft 33 of the trigger 31 which rotates in synchronization with the door D enters the auxiliary groove 3b of the pull-in arm 3 from the recessed groove position on the lower surface of the main body casing 2 as shown in fig. 10(a) and comes into contact with one side surface of the slider 11 on the side facing the door D, and at this time, the side surface of the slider 11 which comes into contact with the trigger shaft 33 is an inclined surface inclined with respect to the pressing direction of the slider compression spring 12. As shown in fig. 10(b), the slider 11 is pushed by the trigger shaft 33, and slides toward the front end of the retraction arm 3 (in the direction of opening the rear end opening of the engagement groove 3 a) against the pushing force of the slider pressure spring 12, and the trigger shaft 22 enters the rear end side portion of the engagement groove 3a while sliding the slider 11. Then, when the entire trigger shaft 22 enters the engaging groove 33, the slide 11 is returned to the original position (the state shown in fig. 7) by the pressing force of the slide pressing spring 12, and the door D is closed as usual.

Further, since the side surface of the slide piece 11, which does not form the engagement groove 3a on the side facing the door D, is parallel to the sliding direction, the slide piece does not slide in the direction of opening the rear end opening of the engagement groove 3a even if a force in the direction of opening the door D (the direction substantially perpendicular to the sliding direction) is applied from the trigger shaft 33 that has entered the engagement groove 3 a. Thus, the trigger shaft 33 does not go back unlike the conventional art described above, and therefore can be stably engaged with the pull-in arm 3 even if the engagement amount with the engagement groove 3a is small. Therefore, when the door is opened from the state shown in fig. 7, the trigger shaft 33 does not have a possibility of coming out from the rear end opening portion of the engagement groove 3a, and even if the door D drops slightly after long-term use, the trigger shaft 33 can be stably engaged with the engagement groove 3a to ensure that the pull-in arm 3 can be rotated to the standby position, and the normal door closing assisting function can be continuously maintained.

All the contents disclosed in the present embodiment are exemplary, and the scope of the present invention is not limited thereto, and can be modified within an appropriate range.

For example, in the above embodiment, the apparatus main body is mounted on the door frame and the trigger is mounted on the door, but it is possible to reverse the apparatus main body mounted on the door and the trigger mounted on the door frame.

Further, the pull-in arm can be configured to have a simpler structure by forming the engagement groove by assembling the slider to the arm body as in the embodiment, and the engagement groove can be formed directly in the arm body.

Claims (3)

1. A door closing assistance device comprising: a device main body connected to one of a door frame and a door rotatably provided with the door frame; a trigger connected to the other of the door frame and the door, the apparatus main body including: the main body box body is rectangular; a pull-in arm that is engageable with the trigger and is rotatably supported in the main body case between a standby position corresponding to a door-open state and a pull-in position corresponding to a door-closed state; a pressing mechanism that presses the pull-in arm on a rotation plane of the pull-in arm; a brake mechanism that brakes rotation of the pull-in arm from a standby position to a pull-in position, wherein the pull-in arm is held at the standby position by a pressing force from the pressing mechanism when the door is in an open state and the pull-in arm of the apparatus main body is not engaged with the trigger, and wherein the trigger engaged with the pull-in arm releases holding of the pull-in arm at the standby position during closing of the door, and the pressing mechanism presses the pull-in arm in a direction to rotate the pull-in arm to the pull-in position, and wherein the pull-in arm is rotated while being braked by the brake mechanism in a state in which the pull-in arm is engaged with the trigger, and the door is pulled to the door frame,

the pull-in arm, which is open at both the front end and the rear end and has an engaging groove for engaging with an engaging member provided on the trigger, includes: an arm body having a rear end rotatably supported by the body case, a slider having an opening at a rear end of the engagement groove slidably fitted to the arm body in an opening/closing direction, and a slider compression spring for pressing the slider in a direction for closing the opening at the rear end of the engagement groove, wherein when the door is opened and the pull-in arm is in a normal state of the standby position, the engagement member of the trigger enters the engagement groove of the pull-in arm from the opening at the front end of the pull-in arm with the door closed, and when the door is opened and the pull-in arm is in an abnormal state of the pull-in position, the engagement member of the trigger comes into contact with the slider of the pull-in arm with the door closed, and then the slider is slid in a direction for opening the opening at the rear end of the engagement groove against a pressing force of the compression spring, thereby entering the engaging groove.

2. The door closing assistance device of claim 1,

the slider of the pull-in arm has an inclined surface inclined with respect to a pressing direction of the slider compression spring on a side opposite to the door, and the slider of the pull-in arm slides in a direction to open the rear end opening of the engagement groove as the engagement member of the trigger is pressed along the inclined surface.

3. A door closing aid according to claim 1 or 2,

the engaging groove of the pull-in arm is formed by assembling the slide piece to the arm body.

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