JP2000291326A - Door closer for opened door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door closer which can be opened by light force, can automatically close by letting go the door at a low speed and can be built in the door. SOLUTION: In a door closer wherein a body case 1 is fixed to a position on top of the upper box or the door frame of a door, and the drive rope 5 led out in the orthogonal direction from the body case 1 is fixed to the other position, and which opens the door resisting the spring force of the spring 6 built in the winding drum 3 of the drive rope 5 and winds the door in the closing direction by the energizing force of a spring by canceling external force, the door is closed by at a low speed by a one way clutch 7 operating through a plurality of gear devices, speed increasing gears 8 and 9 and the centrifugal brake mounted on a brake drum 10. The one way clutch is operated only when the drive rope is wound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door closer for opening a door, and more particularly, to a door closer which can be opened with a small force and which automatically closes an opened sliding door at a low speed.
The present invention relates to a door closer that can be stored in an open door.

[0002]

2. Description of the Related Art As a door closer for automatically opening a door which has been opened, a combination of a link mechanism and a hydraulic cylinder or an air cylinder is generally used. Such a known door-opening closer will be described with reference to JP-A-7-259426. One end of a link mechanism is fixed above an opening of a door frame, and the other end is opened. A flow control valve fixed to a rotary shaft interlocked with a piston in a hydraulic cylinder fixed to the upper part of the hydraulic cylinder in a rack-and-pinion manner and provided in a through hole of the piston while compressing a spring when the door is opened. To allow the internal hydraulic oil to pass through, while the opened door is closed by the return force of the spring while the opening area of the through hole of the piston is reduced by the flow control valve. ing.

[0003]

However, such a known door-opening closer must press the door against a spring when the door is opened. The opening of the door required a considerable amount of power and was burdensome. When the door is closed, the door is closed by the spring force of the spring. In this case, the opening area of the through hole of the piston is reduced, so that the flow resistance of the hydraulic oil in the through hole increases, and the door is closed. Is performed at a low speed, it is impossible to close the door at a high speed even if the door is closed in a hurry, and since the above-mentioned components must be installed inside the door closer, the door closer itself must be closed. Therefore, it was necessary to attach a door closer to the outside of the door, which was not preferable in appearance.

[0004] The present invention has been made in view of the problems of the known door closer for opening, and the object of the present invention is not only to be able to carry out this operation with a light force at the time of opening the door, but also to perform it. The door can be closed automatically at a low speed by releasing your hand from the opened door during normal closing, and it can be closed in a hurry.In addition, the main body case can be built inside the open door, so It is also desirable to provide a door closer for opening doors.

[0005]

According to the present invention, there is provided a door closer for opening a door, wherein a main body case is fixed to one of an upper part of an opening and an upper part of an opening of a door frame. The one end fixed to the main body case winds or unwinds a drive cable led out in a direction substantially perpendicular to the main body case so that the opening opens and closes the opening, and the spring is opened when the opening is opened. The door is opened by applying an external force against a spring, and when the external force is released, the door is a door closer for opening the drive rope at a low speed in a closing direction by a return force of the mainspring spring. A winding drum rotatably mounted in the main body case;
A drive cable attached to the winding drum and rewinded when the door is opened, a spring for urging the winding drum to wind the drive cable, and a one-way that operates only when the drive cable is wound A clutch, at least one speed increasing gear interlocked with the one-way clutch, a brake drum that rotates integrally with the speed increasing gear, and a centrifugal brake attached to the brake drum. It operates only when winding,
A guide roller is provided so that the drive rope wound on the winding drum is led out substantially at right angles to the rotation direction of the winding drum, and the main body case is housed in an open door. It is characterized in that it is led out and one end thereof is fixed above the opening.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of a center cross section of an embodiment of a door closer for opening according to the present invention, FIG. 2 is a side view of the center cross section of FIG. 1, and FIG. 3 is a perspective view showing a state where the door closer of the present invention is mounted on the door. FIGS. 4 and 4 are plan views showing the operation state of the door closer. FIG. 4A is a view showing the closed state, FIG. 4B is a view showing the middle of the door opening, and FIG. 4C is a view showing the fully opened state. 5 is a perspective view showing another embodiment of the mounted state of the door closer of the present invention, wherein 1 is a main body case, 2 is a cover, 3 is a winding drum, 4 is a shaft, 5 is a drive cable, and 6 is a spring. , 7 is a one-way clutch, 8, 9 are speed-up gears, 10
Is a brake drum, 11 is a guide roller, 12, 12 '
Denotes an open door, and 13 denotes an opening.

In the present invention, as shown in FIG. 1 and FIG.
A bearing 2-1 is formed on the shaft 2-1. A shaft 4 for supporting the winding drum 3 is rotatably supported by a bearing 1-1 provided on the main body case 1 on the bearing 2-1. An annular groove 3-1 is formed on the peripheral surface of the drum 3, and the groove 3
The drive rope 5 is wound around -1.

On the other hand, a mainspring spring 6 is disposed on one side of the winding drum 3, and the outer end of the spring 6 is fixed to a spring hook 3-2 formed on the winding drum 3. The inner end of 6 is fixed to a spring hook 4-1 provided on the shaft 4. The upper end of the main body case 1 is provided with an extension portion 1-2 extending in the longitudinal direction integrally with the main body case 1, and the extension portion 1-2 has an opening opening toward the cover 2. The unit 2-2 is provided.

A speed-increasing gear 8 is provided on the shaft 4 of the winding drum 3 so as to be rotatable on the shaft 4, and between the inner peripheral portion of the speed-increasing gear 8 and the outer peripheral portion of the shaft 4. The one-way clutch 7 intervenes, and the one-way clutch 7
Operates only when the driving rope 5 is wound on the winding drum 3 by the mainspring spring 6, and when the driving rope 5 is unwound from the winding drum 3, the rotation of the winding drum 3 is applied to the speed increasing gear 8. It is configured to have no effect.

A gear 8 is provided on the outer periphery of the speed increasing gear 8.
-1, a second speed increasing gear 9 provided with a gear 9-1 meshing with the gear 8-1 on an inner peripheral portion thereof is rotatable around a shaft portion 1-3 protruding from the main body case 1, And the speed increasing gear 8
A gear 9-2 is provided on the outer peripheral portion of the second speed increasing gear 9, and a gear 10-1 meshing with the gear 9-2 is provided on the inner peripheral portion. The brake drum 10 is rotatable around a shaft portion 1-4 protruding from the main body case 1, and is disposed substantially flush with the second speed increasing gear 9. That is, the speed increasing gears 8 and 9 and the brake drum 10 are arranged on a straight line so as to be substantially flush, and as a result, the entire main body case can be formed to be thin.

The brake drum 10 includes a support shaft 10.
Centrifugal brake 1 rotatable around -2, 10-3
0a and 10b are provided, and when the door is moved in the closing direction, that is, when the winding drum 3 winds the drive rope 5,
A centrifugal force acts on the centrifugal brakes 10a and 10b so that the centrifugal brakes 10a and 10b are slidably attached to the inner wall 1-5 provided on the main body case 1 and are frictionally engaged with the inner wall 1-5.

On the other hand, the drive cable 5 wound or unwound by the winding drum 3 is connected to an extension 1-2 of the main body case 1.
The guide roller 11 is rotatably mounted on a support shaft 11-1 disposed in a vertical direction inside the extension portion 1-2 so that the guide roller 11 can be drawn out substantially at right angles to the rotation direction of the winding drum 3 from Is provided. In the illustrated embodiment, two speed increasing gears are provided. However, it is needless to say that the number of the speed increasing gears can be appropriately increased or decreased according to the degree of speed increase or the size of the main body case 1.

In the door closer according to the present invention, since the main body case 1 can be formed into a thin-walled shape, the main body case 1 is housed in the thick portion of the upper edge 12-1 of the opening 12 as shown in FIG. A fixing tool 5-1 provided at an end of the driving cable 5 led out from the main body case 1 is fixed to an upper portion 13-1 of the opening 13 of the door frame.

Next, the operation of one embodiment of the present invention will be described. The drive cable 5 is led out from the main body case 1 housed in the thick portion of the upper edge 12-1 of the sliding door 12, and the attachment 5-1 provided at the end thereof is attached to the upper portion 13 of the opening 13 of the door frame. Fix to -1. Next, the door 1 is opened by the handle 12-2 of the door 12.
2 (see FIG. 4A), the door 12 is opened.
The drive cable 5 is rewound from the winding drum 3 against the mainspring spring 6 with the rotation in the opening direction (see FIG. 4B). At this time, since the one-way clutch 7 does not operate, the force required for opening the door is only sufficient to oppose the spring force of the mainspring spring 6, and therefore a large burden is imposed for opening the door. Nothing.

On the other hand, when the door 12 is completely opened (FIG. 4)
(See (c)) or even during the opening of the door,
When the hand is released from the handle 12-2, the winding drum 3 is urged in the winding direction by the spring force of the mainspring 6 and rotates.
The drive cable 5 is wound around the winding drum. At this time, the one-way clutch 7 operates to rotate the winding drum 3 to increase the speed of the speed increasing gear 8.
This rotation is further transmitted to the brake drum 10 via the second speed increasing gear 9, so that the brake drum 10 rotates at a significantly higher speed than the rotation of the winding drum 3. With the high speed rotation of the brake drum 10, centrifugal force acts on the centrifugal brakes 10a and 10b attached to the brake drum 10, and the support shafts 10-2 and 10b.
-3, the centrifugal brakes 10a and 10b slide on the inner wall 1-5 of the main body case 1 in order to expand,
Thereby, the centrifugal brakes 10a and 10b and the inner walls 1-5
As a result, the winding speed of the drive rope 5 by the winding drum 3 becomes low.

On the other hand, when it is desired to close the door 12 abruptly, the door 12 is pressed in the door closing direction so that the winding drum 3 is closed.
Can close the door 12 faster than the winding speed of the drive rope 5 by the above, the door 12 can return rapidly in the door closing direction without any obstacle. In this case, the driving cable 5
The winding is also slowly wound on the winding drum 3 by the action of the centrifugal brakes 10a and 10b, so that the winding of the drive cable 5 on the winding drum 3 is completed after the door 12 is completely closed.

In the above-described embodiment, the main body case 1 is connected to the upper edge 12-1 of the sliding door 12 in order to enhance the appearance effect.
However, the present invention can also be used by attaching the main body case 1 to the side surface of the upper edge 12'-1 of the existing door 12 'as shown in FIG. In addition, a mounting member 5 for the driving cable 5 is attached to the upper edge 12-1 of the sliding door 12.
1 and the main body case 1 can be attached to the upper frame 13-1 of the opening 13 in the one wall.

[0018]

As described above, according to the present invention, when the door is opened, not only can this be performed with a light force, but also when the door is normally closed, it is automatically lowered by releasing the opened door. Door closers that can be closed at a speed, can be closed quickly, and have a good appearance because the main body case can be built into the door, and can be retrofitted as needed. Can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view at the center of an embodiment of a door closer for opening according to the present invention.

FIG. 2 is a cross-sectional side view of the center of FIG. 1;

FIG. 3 is a perspective view showing a state where the door closer of the present invention is attached to an open door.

FIGS. 4A and 4B are plan views showing an operation state of the door closer according to the present invention, wherein FIG. 4A is a view showing a closed state, FIG. 4B is a view showing the middle of opening, and FIG. It is.

FIG. 5 is a perspective view showing another embodiment of the mounted state of the door closer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 1-1 Bearing 1-2 Extended part 1-3, 1-4 Shaft part 1-5 Inner wall 2 Cover 2-1 Bearing 2-2 Opening part 3 Winding drum 3-1 Depressed groove part 3-2 Spring hook Reference Signs List 4 shaft 4-1 spring hook 5 drive cable 5-1 attachment 6 spring spring 7 one-way clutch 8, 9 speed-up gear 8-1, 9-1, 9-2, 10-1 gear 10 brake drum 10-2, 10-3 Support shaft 10a, 10b Centrifugal brake 11 Guide roller 11-1 Support shaft 12, 12 'Open door 12-1, 12'-1 Upper edge 12-2 Handle 13 Opening of frame 13-1 House Top of the frame

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Minoru Yoshikawa 1-47, Shitennoji, Tennoji-ku, Osaka-shi, Osaka F-term in Matsuroku Co., Ltd. (reference) 2E050 AA03 BA04 CA02 DA02 DB02

Claims (3)

[Claims] 1. A main body case is fixed to one of an upper part of an opening and an upper part of an opening of a door frame, one end of which is fixed to the other, and a driving cable led out from the main body case in a substantially right angle direction. Winding or rewinding, the opening is configured to open and close the opening, and when the door is opened, the door is opened by applying an external force against a mainspring spring, and the door is opened by releasing the external force. An opening door is a door closer for opening the drive rope at a low speed in a closing direction by a return force of the mainspring spring, and a winding drum rotatably mounted in the main body case; A drive cable attached to the take-up drum and rewinded when the door is opened, a mainspring spring for urging the take-up drum to take up the drive cable, and a one-way clutch that operates only when the drive cable is taken up. , The one way kura At least one speed increasing gear interlocked with the gear, a brake drum that rotates integrally with the speed increasing gear, and a centrifugal brake attached to the brake drum. The centrifugal brake is used only when the drive cable is wound. A door closer for opening, characterized in that it operates. 2. The opening according to claim 1, wherein a guide roller is provided so that the drive rope wound on the winding drum is led out at a right angle to the rotation direction of the winding drum. Door closer for doors. 3. The door according to claim 1, wherein the main body case is housed inside the door, only the drive cable is led out, and one end thereof is fixed to an upper portion of the opening. Door closer.