JPH02200985A - Door closer - Google Patents

Abstract

PURPOSE:To simplify the constitution of a door closer by providing the door closer with an energy accumulating means for door opening and closing, connecting means and worms for door rotation to close the door, and a body for supporting ring bodies composed of a speed increasing transmission means. CONSTITUTION:A door closer is provided with connecting means 18 and 19 to connect an energy accumulating means 6 for rotating an input shaft 4 in the door opening direction interlocking with the opening and closing of a door and an input shaft 4 rotated by releasing energy accumulating force in the door closing direction and a worm 11 as final means. In the next step, the door closer is provided with a cup-like non-magnetic electric conductor 29 which is rotated integrally being supported by a speed increasing transmission means 12 transmitting the rotation of the input shaft 4 in the door closing direction and the worm 11. In addition, it is provided with ring-like bodies 30 and 31 for braking by which a magnetic field is generated and a bearing section 22a rotatably supporting one end of the worm 11 to form a ring-like body supporting body 22 by a magnetic body connecting and fixing the two ring-like bodies to each other. Thus, a quiet door closer can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a door closer for automatically closing an open door.

(Prior Art) The most commonly used door closer is an oil-type door closer, in which a piston is slidably inserted into a cylinder filled with a coil spring and oil.
When the door opens, a coil spring is charged, and when the door is closed, the damper effect is achieved by using the flow resistance of oil flowing through a small hole in the piston.

Additionally, a mechanical door closer using a centrifugal force governor has been proposed as a means of obtaining a damper effect. This door closer stores energy in a spring means using an input shaft that rotates in conjunction with the rotation of the door in the opening direction.

By releasing the stored force of the spring means, the input shaft is rotated in the door closing direction to close the door.

When the input shaft rotates in the door closing direction, the rotation of the shaft is transmitted to the governor mechanism at an increased speed via a speed increasing gear train with the worm as the final stage, causing the worm to rotate at a high speed. A brake member made of an elastic body that expands due to centrifugal force is supported by the worm, and a brake cylinder is fixedly disposed around the brake member. When the brake member expands due to centrifugal force, it rubs against the inner peripheral surface of the brake cylinder, applies a brake to the rotation of the worm, and the subsequent rotation of the input shaft, causing it to rotate in the closing direction. Slow down the door speed.

(Problems to be Solved by the Invention) In the above-mentioned oil-type door closer, the viscosity of the sealed oil changes due to the influence of temperature.

The door closing speed fluctuates greatly depending on the environmental temperature.

For this purpose, a speed adjustment mechanism is provided to adjust the flow rate of oil so as to obtain the optimum closing speed, but there is a problem in that the adjustment work is troublesome.

Mechanical door closers have the advantage that there is no variation in closing speed due to environmental temperature. but.

Although gear noise caused by the speed-up gear train can be suppressed by applying lubricating oil or selecting a bearing structure, a rubbing noise is generated when the brake member provided on the worm rubs against the inner circumferential surface of the braking cylinder. This rubbing noise can become relatively large depending on the imbalance in the weight distribution of the brake member, and there is a problem in that it becomes a noise, especially in a quiet environment.

(Means for Solving the Problems) The object of the present invention is to provide a door closer that does not have speed fluctuations due to temperature, which the oil-type door closer has, and also eliminates the frictional noise that is a technical problem with conventional mechanical door closers. , energy storage means that stores energy when the input shaft that rotates in conjunction with opening and closing of the door rotates in the door closing direction, and rotation of the input shaft that rotates in the door closing direction by releasing the stored power of the energy storage means. a connecting means for transmitting a signal to move the door in the closing direction; a speed increasing transmitting means having a worm as the final stage for increasing the speed and transmitting the rotation of the input shaft in the door closing direction; and a cup-shaped non-magnetic conductor that rotates in unison.

It consists of a pair of annular magnets or an annular magnet and an annular magnetic material that surround the cylindrical part of the non-magnetic conductor from the inside and outside without contact, and includes a braking annular body that generates a magnetic field and one end of the worm that is rotatable. The supporting bearing is characterized in that it has a section and an annular body support made of a magnetic material that connects and fixes the two annular bodies constituting the braking annular body to each other.

(Operation) When the door is opened, the input shaft rotates and stores energy in the energy storage means. When the action of opening the door is released, the stored force of the energy storing means is released and the input shaft rotates in the direction of closing the door.The rotation of the input shaft is transmitted to the worm through a speed increasing gear train, and it is rotated at high speed. Rotate with . When the worm rotates, a non-magnetic conductor integrated with the worm rotates within the magnetic field formed by the braking annular body, generating an induced electromotive force. This induced electromotive force is.

It flows in a direction that cancels out the magnetic field, and brakes the rotation of the worm, that is, the movement of the door in the closing direction.

(Example) The present invention will be described in detail below based on an example shown in the drawings.

In FIGS. 1 and 2, an input shaft 4 is rotatably supported by bearings 2 and 3 provided on the frame 1 approximately at the center of the frame 1. As shown in FIGS. The input shaft 4 is formed with a toothed portion 4a and a cylindrical portion 4b having a diameter substantially equal to the tip circle of the toothed portion. A slider 5 is slidably provided on the frame 1, and this slider includes a rack portion 5a that meshes with the teeth 4a of the input shaft 4, a cam portion 5b, and a coil spring to be described later. The cylindrical part 4b of the input shaft 4 is
A non-rack portion 5c that engages with each other is formed respectively.

At the end of the slider 5 opposite to the end on which the cam portion 5b is formed, a spring receiving portion 5d is formed to receive one end of a coil spring 6 serving as an energy accumulating means. The other end of the coil spring 6 is fixed to the frame 1 and supported by a plate 7. The coil spring 7 is precompressed and housed in the frame to the extent that it can engage the door latch.

Inside the frame 1, there is a transmission member 8 formed with a cam portion 8a that abuts against the cam portion 5b of the slider 5, and a two-stage gear 9.
A speed increasing transmission means 12 consisting of a worm wheel 10 and a worm 11 is provided.

Further, the worm 11 is provided with a braking means 13. The transmission member 8 is rotatably supported by a support shaft 14 provided on the frame, and is given the habit of rotating in accordance with the movement of the slider 5 when the door is opened by a biasing means (not shown). . The cam portion 8a abuts against the cam portion 5b of the slider 5 that moves linearly. The two-stage gear 9 is rotatably supported by a support shaft 15 provided on the frame, and its small-diameter tooth portion 9a meshes with the tooth portion 8b of the transmission member 8. The large-diameter tooth portion 9b of the two-stage gear 9 meshes with the small-diameter tooth portion 10a of the worm wheel 10. The worm wheel IO is rotatably supported by a support shaft 16 provided on the frame, and its large diameter teeth 10b mesh with the worm 11. A one-way transmission clutch (not shown) is provided between the small diameter toothed portion 10a and the large diameter toothed portion 10b of the worm wheel 10. In this one-way transmission clutch, when the door is opened, the rotation of the two-stage gear 9 is interrupted between the small-diameter tooth portion 10a and the large-diameter tooth portion 10b, and when the door is closed, the rotation of the two-stage gear 9 is cut off between the small-diameter tooth portion 10a and the large-diameter tooth portion 10b. The tooth portion 10a and the large diameter tooth portion 10b are integrated. In other words, the speed increasing transmission means 12 transmits the transmission member 8. Double gear 9. Worm wheel 10. It consists of Warm 11,
The rotation of the input shaft 4 rotated by the slider 5 is increased in speed and transmitted to the worm 11.

The worm 11 constitutes the final stage of the speed increasing transmission means 12.

A bearing provided on a braking means 13, one end of which will be described later, is supported by a bearing member 17, and the other end Ha is rotatably supported by a bearing member 17 fixed to a frame.

The frame 1 is fixed to one side of the door D, as shown in FIG. The square shaft portion 4c at one end of the input shaft 4 has a
One end of arm 18 is integrally engaged. Arm 1
The other end of the arm 19 is pivoted at its base end 19a to the other end of an arm 19 which is swingably supported at a suitable position on the door frame. An arm 18 that is substantially integral with the input shaft 4 and an arm 19 that is pivotally connected to the arm 18 constitute a coupling means. In FIG. 8, reference numeral 20 indicates a part of the door frame, and the door D is supported by a hinge 21 so as to be openable and closable.

3 and 4, the structure of the braking means 13 will be explained. The other end 11b of the worm 11 is rotatably supported by a bearing portion 22a formed at the center of a yoke holder 22, which serves as an annular body support made of a magnetic material, preferably a high permeability magnetic material. The yoke holder 22 is attached to the frame 1
After the rotation stopper protrusion 22b is engaged with the bent portion 23a of the support plate 23 fixed to the.

It is fixed with screws 24. At the end of the worm 11.

A ratchet 27 is integrally inserted into the worm between the two wheels, into which the stops 24 and 25 are fitted, so that the cup holder 26 can rotate. A washer 28 is interposed between the retaining ring 25 and the ratchet 27. The cup holder 26 includes a cup-shaped non-magnetic conductor (hereinafter referred to as “
A bottom portion 29a of a cup (referred to as a cup) 29 is fixedly supported so as to be concentric with the worm 11.

Cup 29 is made of a non-magnetic conductive material such as steel, aluminum, or the like. Ratchet 27.

It is made of spring steel or synthetic resin, and a check pawl 27a formed at its tip engages with a sawtooth check tooth 29b formed on the inner bottom surface of the cup 29.

The ratchet 27 and the check teeth 29b constitute an overload avoidance mechanism.

An annular magnet 30 made of a permanent magnet is closely fitted and fixed to a cylindrical boss portion 22c forming the bearing portion 22a of the yoke holder 22. This ring magnet 30
is disposed with a gap G1 between its outer circumferential surface and the same portion within the cylindrical portion 29c of the cup 29, that is, in a non-contact state with the cup 29. A yoke 31, which is an annular magnetic body, is fixed to the yoke holder 22, and is disposed with a gap G2 between the inner peripheral surface of the yoke holder 22 and the outer peripheral surface of the cylindrical portion 29c of the cup 29, that is, without contacting the cup 29. has been done. The yoke 31 made of a magnetic material such as iron is attached to the yoke holder 2.
2 is in magnetic contact. And the annular magnet 30.

It is magnetized to generate a magnetic field in the annular gap (Gl, G2) between the yoke 31 and the yoke holder 22. Note that by selecting the direction of magnetization, a permanent magnet can be used as the annular magnetic body instead of the yoke 31'. A braking annular body is constituted by the annular magnet 30 and the yoke 31 or a pair of annular magnets. Note that the braking annular body does not need to be annular in shape, and it is sufficient that the magnetic poles for generating a magnetic field are arranged in an annular manner inside and outside the cylindrical portion 29e of the cup 29 without contact. .

In addition, the bent portion 23b of the support plate 23 has the following properties. [11 Screw 32 is inserted rotatably. This screw 32 has
An adjustment plate 33 made of a magnetic material is screwed together.

The tip edge of the adjustment plate 33 is disposed so as to be able to come alongside the outer peripheral surface of the annular magnet 30 through the window hole of the yoke 31. A coil spring 34 is elastically mounted between the bent portion 23b and the adjustment plate 33. When the adjustment screw 32 is screwed forward to bring the tip edge of the adjustment plate 33 into contact with the annular magnet 30, the magnetic flux between the annular magnet and the yoke is short-circuited and the magnetic flux density between them is changed.

The operation of the embodiment configured as above will be explained. 8th
The door indicated by the chain line DA in the figure is in a closed state. When the door is closed, the coil spring 6 extends and rotates the input shaft 4 via the slider 5, thereby holding the door in the closed position. When the door DA is opened in the direction of the arrow, the input shaft 4 is rotated and the slider 5 is moved. As the slider 5 moves, the coil spring 6 is compressed and energized, as shown in FIG. FIG. 1 shows the state when the door is opened to the position shown by the solid line in FIG. As shown in FIG. 1, the coil spring 6 is no longer charged.
Following this, the transmission member 8 rotates in the opposite direction due to its habit. The rotation of the transmission member 8 rotates the two-stage gear 9 and the small diameter tooth portion 10a of the worm wheel 10.

This rotation is not transmitted to the large-diameter tooth portion 10b and the worm 11 due to the action of a one-way transmission clutch (not shown).Therefore, when the door is opened, the worm does not rotate and no braking is applied.

When the opening operation for the door placed in the open position shown by the solid line in FIG. 8 or the stopper not shown is released,
The input shaft 4 is rotated counterclockwise when the slider 5, which is biased by the coil spring 6, moves in the direction of arrow a (see FIG. 2), so that its teeth 4a mesh with the rack part 5a. . Rotation of the input shaft 4 rotates the door D via the arm 18.19 towards the closed position 1iDA. When the slider 5 moves in the direction of arrow a, which is the door closing direction, the transmission member 8, which aligns the cam part 8a with the cam part 5b, is pushed and rotated in the direction of the arrow, as shown in FIG. I am made to do so. The rotation of the transmission member 8 causes the small diameter tooth portion 10a to rotate in the direction of arrow C via the two-stage gear 9. The rotation of the small diameter toothed portion 10a is transmitted to the large diameter toothed portion 10b by the action of the one-way transmission clutch, causing the worm wheel 10 to rotate in the same direction and the worm 11 to rotate at a high speed.

When the worm 11 rotates, the annular magnet 30 and the yoke 31
The cup 29 rotates within the magnetic field (gap Gl, G2) formed by the cup 29, and an induced electromotive force is generated therein. This induced electromotive force is an eddy current that cancels out the magnetic field, and acts in a direction that brakes the rotation of the cup 29 made of a non-magnetic conductive material. Moreover, the higher the speed of the cup 29 crossing the magnetic field, that is, the higher the rotational speed of the cup 29, the more these eddy currents are generated, and the more braking force is applied to the cup. The braking applied to the cup applies a braking force to the rotation of the worm 11, and thus applies a brake to the rotation of the speed increasing transmission means 12 that actively rotates the worm, that is, the rotation of the input shaft 4. The braked input shaft 4 slows down the rotation speed of the door D in the closing direction. As the closing speed of the door D increases, that is, as the rotation speed of the input shaft 4 increases, the rotation of the worm 11 also increases, the induced electromotive force increases, and a large braking force is generated, which reduces the closing speed of the door. remains approximately constant.

By the way, the door D is not necessarily closed automatically by releasing the stored force of the coil spring 6, but may be forcibly closed. In this case, the input shaft 4 forcibly moves the slider 5 to be moved by releasing the stored force of the coil spring 6. This movement of the slider 5 forces the worm 11 to rotate at a high speed via the speed increasing transmission means 12. As already explained, when the worm 11 rotates at a high speed, the cup 29 is braked by the induced electromotive force, but a driving force exceeding this braking force acts on the worm 11. Then, the ratchet 27 is elastically deformed and the non-return pawl 27a disengages from the non-return teeth 29b of the cup holder 29.

This allows the worm 11 to rotate in advance of the cup 29 being braked.

Overload on the speed increasing gear train including the worm 11 can be avoided.

Note that in the illustrated embodiment, the coil spring 6 of the energy storage means is
The slider 5 is used as a means for transmitting the release of the stored force to the worm. Transmission member 8. Although a two-stage gear 9 is provided, a transmission member 8 for converting the linear motion of the slider into rotational motion may be directly engaged with the worm wheel 10, an example of which is shown in FIG.

Components having the same functions as those shown in FIG. 1 are designated by the same reference numerals, and only distinctive components will be described. A roller 50b as a cam follower is supported on the ls portion of the slider 50.

Cam portion 80 of transmission member 80 biased by torsion spring 81
a collides. Tooth portion 8 of transmission member 80
0b is formed in a larger diameter portion than the cam portion 80a,
It meshes with the small diameter tooth portion 10a of the worm wheel 10. A one-way transmission clutch (not shown) is disposed between the small-diameter tooth portion 10a and the large-diameter tooth portion 10b. In FIG. 7, reference numeral 70 indicates a slider guide roller, reference numeral 71 indicates a slider stopper, and reference numeral 72 indicates a guide groove of the roller 50b.

In addition, in the illustrated embodiment, the release of the stored force of the coil spring is transmitted to the worm 11 by pushing and rotating the transmission member with the cam portion of the slider, but the input shaft 4 rotated by the slider is Of course, the rotation may be transmitted to the worm 11 using a gear train. Further, as the IP force means, a spring means such as a constant torque spring may be used instead of a coil spring.

To briefly explain the closing speed tAm of door D,
In FIG. 3, when the adjusting screw 32 is screwed to bring the tip of the adjusting plate 33 into contact with the circumferential surface of the annular magnet 30,
The magnetic flux density of the magnetic field formed between the annular magnet 30 and the yoke 31 changes, and the magnitude of the induced electromotive force generated in the cup 29 changes, and the power is adjusted to be applied to the worm 11. Braking force can be changed.

Another example of a braking means having a door closing speed adjusting function will be explained in the fifth section and FIG. 6. Note that members that are the same as those already described are given the same reference numerals, and individual explanations will be omitted. One end 11b of the worm 11 is rotatably supported by a bearing portion 50a formed in a bearing member 50. The bearing member 50 is rotatably inserted into a boss portion 51c of a yoke holder 51 made of a magnetic material. The yoke holder 51 is.

The annular magnet 30 and the yoke 3I are connected and fixed to each other, and the outer peripheral edge thereof is projected to the outside through the window hole 23c of the support plate 23 as the operating portion 51b.

A screw hole 51a is formed in the boss portion 51c.

A threaded portion 52a of an adjustment screw 52 is screwed into the threaded hole 51a. One end 52b of the adjustment screw 52 is fixedly supported by the support plate 23, and the other end is fitted with a bearing to support the member 50. The end portion (not shown) of the worm 11 is connected to the seventh
It is supported by a bearing member indicated by reference numeral 17 in the figure.

Therefore, the worm 11, that is, the cup 29 is supported so as to be rotated at a fixed position in the axial direction. A magnetic field is formed in the gap between the annular magnet 30 and the yoke 31, and the cylindrical portion 29c of the cup 29 is positioned in this gap without contacting it.

When adjusting the speed, when the yoke holder 51 is rotated in an appropriate direction, this holder is screwed forward according to the adjustment screw 52 and is moved in the axial direction of the worm 11. Then, the magnetic field formed by the annular magnet 30 and the yoke 31 changes the relative position of the cup 29 with respect to the cylindrical portion 29c across the magnetic field, and the cup 29 rotates once.
The eddy current generated in the cup changes, and the braking force applied to the cup, that is, the worm 11, changes. Such speed mu belongs to fine adjustment when viewed from the overall structure of the door closer.

(Effects of the Invention) As described above, according to the present invention, since the door closing speed is braked by applying eddy current braking to the non-magnetic conductor that rotates at high speed without contacting the magnetic field generating means, A quiet door closer that does not generate frictional noise can be obtained. Furthermore, since the braking means is not affected by temperature, there is no speed variation due to environmental temperature, and there is no need to adjust the closing speed in response to temperature changes. Furthermore.

A pair of annular magnets or an annular magnet and an annular magnetic body are connected to each other by an annular body support, and a worm bearing is provided on this, so that the annular body and the worm are easily concentric, and the configuration is simple. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a door closer showing an embodiment of the present invention, FIG. 2 is a plan sectional view of the same, and FIG. 3 is a worm, a nonmagnetic conductor, an annular magnet, an annular magnetic material, and an annular body support. 4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a sectional view showing another example of the braking means, and FIG. 6 is a plan view of the same. , FIG. 7 is a vertical sectional view showing only the essential parts of another embodiment of the present invention, and FIG. 8 is a schematic plan view showing the opening and closing positions of the door. 4... Input shaft, 6... Energy storage means, 18.19...
Connection means. 12... Speed-up transmission means, 11... Worm, 29...
... Non-magnetic conductor, 30.31 ... Braking annular body,
22.51... Annular body support, 22a, 50a...
Bearings are part, D, DA...door. Act 40 Sword B Akane Ichikuchi

Claims (1)

[Claims] An input shaft that rotates in conjunction with opening and closing of the door, an energy accumulating means that stores energy when the input shaft rotates in the door opening direction, and a door and a door frame are connected, and the energy accumulating means stores energy when the input shaft rotates in the door opening direction. A connecting means that transmits the rotation of the input shaft rotating in the door closing direction by force release to move the door in the closing direction, and a worm as the final stage, speeding up the rotation of the input shaft in the door closing direction. A speed increasing transmission means for transmitting the data, a cup-shaped non-magnetic conductor that is supported by the worm and rotates integrally with the worm, and a pair of annular magnets that surround the cylindrical part of the non-magnetic conductor from the inside and outside without contact. Alternatively, a braking annular body made of an annular magnet and an annular magnetic body, and a bearing part that rotatably supports one end of the worm, and a magnetic material that connects and fixes the two annular bodies constituting the braking annular body to each other. A door closer comprising an annular support body consisting of a body.