JP2000204841A - Door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door closer of a simple structure to securely actuate in which a stopper mechanism is assembled. SOLUTION: This door closer is provided with a support cylinder 1 having a step part at an inner circumferential edge at an opening end, an actuation cam 12 provided with a spiral cam surface 13 and a flat surface part 14 perpendicular to a spiral shaft on a lower surface, and rotatably engaged in an opening end part of the support cylinder 1 to put an upper surface having an irregular cross sectional hole coaxial with the spiral shaft on the outer side, a floating plug 17 of which outer end is connected to a lower surface of the actuation cam 12, and of which rotation about an axial line of the support cylinder 1 is restrained, a spring member 22 resiliently installed in the support cylinder 1 to energize the floating plug 17 toward the actuation cam 12, and a connection device 2 comprising a connection shaft 23 having a deformed cross sectional part to be engaged with the deformed cross sectional hole in the actuation cam 12 at least at a tip which is held to be freely protruded/retracted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door closer which automatically closes a door by the force of a spring, and more particularly to a stopper function which can operate reliably with a simple structure and can keep the door open. Door closer having.

[0002]

2. Description of the Related Art A door closer is usually associated with a link device using a hydraulic shock absorber. As a door closer for closing a light door, for example, there is a so-called spring hinge incorporating a coil spring twisted into a hinge.

[0003]

However, the above-mentioned so-called spring hinge usually requires a spring to be incorporated in a small space between the core rod of the hinge and the outer cylinder. There is an inconvenience of lack of sex.

On the other hand, a door closer having a hydraulic shock absorber is unbalanced with a simple door or a light door, and has a feeling of breaking a chicken with a sword.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a door closer incorporating a stopper mechanism which has a simple structure, operates reliably, and can keep a door open.

[0006]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 comprises a support cylinder having a step formed on an inner peripheral edge of an opening end and a member forming a part of a cylinder. A helical cam surface and a flat portion perpendicular to the helical axis are continuously provided on one surface, and a modified cross-section hole coaxial with the helical axis is formed. And a floating plug slidably fitted in a support cylinder inside the operation cam, the outer end of which is joined to one surface of the operation cam, and the rotation of the support cylinder about an axis is restricted. And a spring member elastically mounted in the support cylinder for urging the floating plug in the direction of the operating cam, and a connecting shaft having at least a distal end formed with a deformed cross-section that fits into the deformed cross-section hole of the operating cam so as to be able to be taken in and out. With the supporting cylinder and the connecting device coaxially arranged, One to support cylinder of the upper end edge support end and the door frame, characterized in that the connecting device to the other respective attached.

According to a second aspect of the present invention, a spiral cam surface is formed at the outer end of the floating plug so as to be surface-connected to the cam surface of the operation cam.

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the door closer A according to the present invention is mounted on the upper left corner of the door D in FIG.

In the illustrated embodiment, the support cylinder 1 is mounted on the door D side, and the connecting device 2 is mounted on the door frame 3 side.

At the lower edge of the door D, a thrust bearing B is mounted coaxially with the door closer A to carry the weight of the door and open and close the free edge of the door in an arc. I'm guiding you.

As shown in FIG. 2, for example, the thrust bearing B is planted on the floor surface 4 and has a support pin 5 having a thick flange-like head, and a lower end edge support end of the door with the opening downward. And a cup-shaped receiving body 6 attached to the base body, and the receiving body 6 is provided with an anti-friction coat such as Teflon on its inner surface,
The load on the door is carried by the support pins 5 through the joint between the anti-friction coat 7 and the head of the support pins 5.

On the other hand, as shown in FIG. 3, the support cylinder 1 is a cylinder having a flange for mounting at an upper end and a step 8 formed at an inner peripheral edge of an open end at an upper end. The lower end opening is closed by a disk-shaped bottom plate 9 which is screwed with the female screw portion formed at the bottom.

As shown in FIG. 4, an operation cam 12 is rotatably fitted to the upper end of the support cylinder 1 via an annular thrust ring 11 mounted on the step portion 8.

As shown in FIGS. 5 to 7, the operating cam 12 is a member forming a part of a cylinder, and has a helical cam surface 13 and a vertical surface perpendicular to a helical axis on one surface (lower surface in the drawing). The flat portion 14 is provided continuously.

A core rod 15 for supporting and guiding a floating plug described later is coaxially and integrally connected to one surface of the operation cam 12.

The core rod 15 is provided to ensure the support and guide of the floating plug described later, and is not an essential component of the present invention.

The cam surface 13 in the embodiment shown in FIG.
Are formed vertically symmetrically with respect to a horizontal line passing through the center axis of the core rod 15. This is because this door closer is applied to a door that can be opened inside and outside.

In FIG. 7, for example, a vertical line passing through the central axis of the core rod 15 is a line that cannot be actually seen if both sides are smoothly connected. It is drawn to show the boundary between the cam surface 13 and the plane portion 14.

On the other surface (the upper surface in the figure) of the operation cam 12, for example, an oval shaped section hole 16 is formed coaxially with the helical axis.

On the other hand, a floating plug 17 is slidably fitted below the operation cam 12 of the support cylinder 1 as shown in FIG.

As shown in FIGS. 8 and 9, the floating plug 17 has a helical cam surface 13 at the outer end (upper end) facing the operation cam 12 similarly to the operation cam and a flat portion perpendicular to the helical axis. 14 are connected to each other, and the outer diameter thereof is set to, for example, substantially the same as the outer diameter of the operation cam 12 and the inner diameter of the support cylinder 1.

The floating plug 17 is formed with a guide hole 18 rotatably fitted on the core rod 15 (see FIG. 5) of the operation cam 12 along the center axis thereof.

FIG. 9 shows the outer peripheral surface of the floating plug 17.
A guide pin 19 is protruded from the lower end of
The guide pin 19 is slidably engaged with a guide slot 21 (see FIG. 3) that opens in a part of the support cylinder 1 along the generatrix direction (see FIG. 4).

With the above-described configuration, the floating plug 17 can relatively move in the axial direction of the support cylinder 1 by a fixed distance, but the rotation of the support cylinder 1 around the axis is restricted.

As shown in FIG. 4, a spring member 22 such as a compression coil spring is elastically mounted between the bottom plate 9 of the support cylinder 1 and the floating plug 17. The floating plug 17 is urged in a direction in which its cam surface is pressed against the cam surface 13 of the operation cam 12.

In the embodiment shown in FIG. 4, a hexagonal wrench is inserted into a hexagonal opening formed in the center of the bottom plate 9 and turned to move the bottom plate 9 up and down along the axis of the support cylinder 1. As a result, the elasticity of the spring member 22 can be adjusted.

As shown in FIG. 4, the core members 15 of the various components described above are inserted into the guide holes 18 (see FIG. 9) of the operation cam 12 in the support cylinder 1 fixed to the door D. The floating plug 17 is joined in this state, and the spring member 22 presses the floating plug 17 against the step portion 8 of the inner cylinder 1 via the thrust ring 11 to form a support cylinder block.

On the other hand, as shown in FIG. 4, a connecting device 2 is provided on the door frame 3, and the connecting device has a modified cross section (FIG. 4) which is fitted at least at the tip with the modified cross section hole 16 of the operation cam. This is a known device which holds the connecting shaft 23 formed in an oval shape in the illustrated embodiment so as to be able to be taken in and out, except that the cross-sectional shape of the connecting shaft is irregular.

In a normal configuration, the connecting shaft 23 is urged in a direction to protrude outward (downward in the embodiment shown in FIG. 4). By operating, the connecting shaft can be retracted.

The door closer constructed as above is
When the door is hung on the door frame, first, the receiving body 6 of the thrust bearing B is put on the support pin 5, then the operation pin 24 is lifted, and the door is inserted into the door frame with the connecting shaft 23 retracted upward. , Connecting section 23 and irregularly shaped section hole 16 of operation cam 12
Is aligned, the connecting shaft 23 is released, and the connecting shaft 23 is fitted into the modified cross-section hole 16 by the urging force of the connecting shaft.

In the door closer according to the present invention, if, for example, the knob K in FIG. 1 is gripped and pushed away, the support cylinder 1 mounted on the door D side is counterclockwise as viewed from above as shown in FIG. Rotate in the direction.

As is apparent from FIG. 4, the operation cam 12 in the support cylinder 1 is prevented from rotating around the axis of the support cylinder 1 by engagement with the connecting shaft 23.

Further, as described above, the floating plug 17 fitted to the support cylinder 1 is restrained from rotating relative to the axis of the support cylinder 1, so that the floating plug 17 operates integrally with the support cylinder 1. It rotates relative to the cam 12.

As a result, the cam surface 13 of the floating plug 17 receives a force in the direction of moving upward by the wedge action while being in sliding contact with that of the operation cam 12.

Then, as shown in FIG.
2 is pushed down by the operation cam 12 while being contracted.

At this time, as is apparent from FIGS. 4 and 10, since the operation cam 12 is in a state of being locked to the door frame 3 via the connection shaft 23, the upper surface of the operation cam 12 And the lower surface thereof is slidably contacted with the upper portion of the floating plug 17 and relatively rotated in the support cylinder 1.

When a person removes his / her hand from the door after the person enters or exits the door, the cam surfaces 13 and 13 of the operating cam 12 and the floating plug 17 are released.
Are joined, for example, when the opening of the door is at an acute angle, the spring member 22 exerts an elastic force on the floating plug 17 pushed down by the operation cam 12 so as to press the floating plug 17 against the operation cam 12. .

As a result, the floating plug 17 is
As the support cylinder 1 and the door D, which are integrated with the cam surface 13 in the rotation direction, receive a force in the closing direction, the door is automatically closed.

More precisely, the tangential component of the elastic force of the spring member 19 in the tangential direction of the operating cam 12 attempts to rotate the operating cam 12, but the operating cam 12 is fixed to the door frame 3. Therefore, the floating plug 1
7 receives a rotational moment in the door closing direction.

This rotational moment can be freely set by adjusting the elasticity of the spring member 22, the inclination of the cam surface 13, and the like.

On the other hand, the uppermost portion of the cam surface 13 of the floating plug 17 moves rightward from the position shown in FIG.
When the knob is joined to the flat portion 14, the elastic force of the spring member 22 acts only perpendicularly to the flat portion 14, and the above-described wedge action does not occur. Therefore, even if the hand is released from the knob, the door does not close.

The state in which the stopper is applied to the door can be easily released by slightly closing the door and joining the cam surface 13 of the floating plug to that of the operation cam 12.

In the illustrated embodiment, the support cylinder 1 is provided on the door D side, and the connecting device 2 is provided on the door frame 3 side. May be reversed.

Although the operating cam 12 and the floating plug 17 are in surface contact with each other, a roller (not shown) is provided on the driven floating plug side as in a conventional three-dimensional cam apparatus.
Friction may be reduced.

[0044]

As is apparent from the above description, the present invention has a large degree of freedom in setting the size of the spring member for determining the rotational moment for driving the door in the closing direction and the degree of inclination of the cam surface. It is possible to set a proper closing rotational moment and improve the reliability of operation of the door closer with a simple configuration.

Further, since a flat portion is continuously provided on the cam surface and the floating plug is joined to the flat portion when the opening of the door is large, the door closer can be provided with a stopper function. Has the effect of

[Brief description of the drawings]

FIG. 1 is a diagrammatic front view of a door equipped with a door closer according to an embodiment of the present invention.

FIG. 2 is a diagrammatic sectional view showing the structure of a thrust bearing.

FIG. 3 is a partial cross-sectional front view of a support cylinder.

FIG. 4 is a partially sectional front view of the door closer according to one embodiment of the present invention, showing a state where the door is closed.

FIG. 5 is a partial cross-sectional front view of an operation cam.

FIG. 6 is a plan view of an operation cam.

FIG. 7 is a bottom view of the operation cam.

FIG. 8 is a plan view of a floating plug.

FIG. 9 is a front view of the floating plug.

FIG. 10 is a partial cross-sectional front view of the door closer according to one embodiment of the present invention, showing a state where the door is open.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support cylinder 2 Connecting device 3 Door frame 8 Step part 12 Working cam 13 Cam surface 14 Flat part 16 Irregular cross section hole 17 Floating plug 19 Guide pin 21 Guide long hole 22 Spring member 23 Connecting shaft

Claims (2)

[Claims] A helical cam surface and a flat surface perpendicular to a helical axis are continuously provided on one surface of a support cylinder having a step formed on an inner peripheral edge of an open end and a member forming a part of a cylinder. An operation cam rotatably fitted to the opening end of the support cylinder with the other surface having a modified cross-section hole coaxial with the shaft facing outward, and slidably fitted into the support cylinder inside the operation cam. A floating plug, the outer end of which is joined to one surface of the operation cam and whose rotation around the axis of the support cylinder is restricted, and a spring which is elastically mounted in the support cylinder and urges the floating plug in the direction of the operation cam. A state in which a supporting cylinder and a connecting device are coaxially arranged, having a member, and a connecting device having at least a connecting shaft formed with a deformed cross-sectional portion that fits with a deformed cross-sectional hole of an operation cam at an end thereof so as to be able to be inserted and removed. so,
A door closer characterized in that a support cylinder is mounted on one of a top end supporting end portion of a door and a door frame, and a connecting device is mounted on the other. 2. The door closer according to claim 1, wherein a spiral cam surface is formed at an outer end of the floating plug so as to be surface-joined with a cam surface of the operation cam.