JPH1193501A - Door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display buffer force corresponding to the closing force of a door even when the door is flapped by a stong wind at the time of door closing. SOLUTION: The door closer consists of a slider 4 movably guided in the longitudinal direction in a frame body 1, a return spring 5, a rack 6 formed to the slider 4, a main shaft 2, to which a pinion 3 engaged with the rack 6 is fixed, a gear speed-increasing mechanism connected to the main shaft 2, one-way clutch 7 installed to either of shafts, and a first brake mechanism 8 and a second brake mechanism 9 mounted on the output shaft 34 of the gear speed-increasing mechanism. The first brake mechanism 8 displays brake force by the generation of an eddy current, and the second brake mechanism 9 brings a plurality of rockable control pieces 93 into contact with a receiving cylinder 94 against the force of a control spring 95, thus exhibiting brake force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a pure mechanical type door closer which does not use hydraulic oil.

[0002]

2. Description of the Related Art A door closer of the type in which the restoring force of a return spring is mechanically buffered is disclosed, for example, in Japanese Patent Application No. Hei.
No. 157564 or Japanese Patent Application No. 8-338917.

[0003] These closers include a hollow frame attached to a door or a door frame, a slider guided movably in a longitudinal direction within the frame, and a return spring for urging the slider in a direction toward a normal position. A pinion that meshes with a rack formed on the side surface of the slider, a main rotation shaft that is rotatably supported by the frame, fixes the pinion, and has a linking arm attached to a portion protruding outside the frame;
Consists of a gear speed increasing mechanism connected to the main rotating shaft, a one-way clutch provided on one of the rotating shafts, and a brake mechanism provided on the output shaft of the gear speed increasing mechanism, and does not use hydraulic oil. Therefore, there is an advantage that there is no fear of oil leakage, and there is no problem of high cost in manufacturing by sealing processing around the cylinder.

[0004] However, in these conventional closers, if a relatively strong wind blows on the door as a follow-up wind when the door is closed, one brake mechanism will have insufficient cushioning force, and the door will close at an extremely high speed. Things happened from time to time.

[0005] According to this phenomenon, there is a danger of the hand being pinched between the door and the door frame and a problem of noise when the door is closed. There is still room for improvement in the door closer as described above. Can be

On the other hand, if the braking force of the brake mechanism is increased in preparation for strong winds, the door closer will inevitably increase in size and the manufacturing cost will increase. In addition, the door closing speed will decrease in normal use. Inconvenience occurs.

[0007]

SUMMARY OF THE INVENTION A door closer according to the present invention provides a buffering force corresponding to a closing force of a door even when the door is blown by a strong wind when the door is closed. It has been proposed as a purpose.

[0008]

In order to achieve the above object, a door closer according to a first aspect of the present invention has a hollow frame attached to a door or a door frame, and is movable in a longitudinal direction in the frame. , A return spring for urging the slider in a direction toward the normal position, a pinion that meshes with a rack formed on the side surface of the slider, and a pinion that is rotatably supported by the frame body and is fixed. Together, a main rotating shaft to which a linking arm is attached to a portion protruding outside the frame, a gear speed increasing mechanism connected to the main rotating shaft,
A one-way clutch provided on one of the rotating shafts, and a first brake mechanism and a second brake mechanism provided on the same axis as the output shaft of the gear speed increasing mechanism, wherein the first brake mechanism is connected to the output shaft. A fixed conductor and a pair of fixed magnets which are paired in a positional relationship sandwiching the conductor are provided, and the second brake mechanism is provided on a rotating substrate fixed to the output shaft and on the rotating substrate. The contact portion on the distal end side of the plurality of brake pieces having the base end pivotally attached to the pivot so as to be swingable, the receiving cylinder fixed to the rotating substrate along the circumference of the rotating substrate with a gap therebetween, and each control piece is normally in contact with A control spring configured to maintain a non-contact state with the receiving cylinder and to allow a free end of the free end of the braking piece to tilt outward when the rotating substrate rotates at a predetermined rotation speed or more. I do.

A door closer according to a second aspect of the present invention is the door closer according to the first aspect, wherein a control spring that bridges between a pair of braking pieces and an output shaft of the gear speed increasing mechanism is one. The control spring shall be common, and the control spring shall be formed in the shape of meandering wire in the same plane, and shall have a pair of arcuate mounting parts facing each other in a pair at the center for clamping to the output shaft. It is characterized by.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. 1 and 2,
Reference numeral 1 denotes a hollow and elongated box-shaped frame which is attached to the door 10 or the door frame with screws 19 or the like. Reference numeral 11 denotes a cover plate fixed so as to cover the opening of the frame 1.

A cylindrical slider receiver 12 is fixedly mounted in the frame 1, and a slider 4 is fitted into the slider receiver 12, and the slider 4 is guided by the slider receiver 12 to form a frame. The body 1 can be moved in the longitudinal direction, that is, in the lateral direction (left-right direction) in FIGS. 1 and 2.

The slider 4 is formed, for example, in a cylindrical shape with a bottom, and a rack 6 is fixed to an outer surface thereof along a generatrix. The rack 6 protrudes outward from the slider receiver 12 through a slit 12 a formed along the generatrix of the slider receiver 12.

A compression spring as a return spring 5 is mounted in a compressed state between the inner bottom surface of the slider 4 and a spring receiver 13 also serving as a lid member for closing the opening of the slider receiver 12. 4 is urged in a direction toward the normal position (to the left in FIG. 1).

On the other hand, a vertical main rotating shaft 2 having both ends or one end protruding outward is rotatably supported at the center portion of the frame 1, and the main rotating shaft 2 has the above-described rack. The pinion 3 meshing with 6 is fixed.

One end of a link arm (not shown) is fixed to the outer end of the main rotary shaft 2, and the other end of the link arm is connected to a door frame or a door frame via another link arm like a conventional door closer. It is connected to the door.

Further, a large bevel gear 21 having a relatively large number of teeth is mounted on the main rotating shaft 2 in the frame 1. Also,
One end of the first support shaft 31 supported by the bracket 14 (FIG. 1)
2 and a small bevel gear 22 having a relatively small number of teeth.
The small bevel gear 22 is meshed with the large bevel gear 21.

The one-way clutch 7 is mounted on the first support shaft 31.
Is mounted, and the drive side shaft 31 of the first support shaft 31 is mounted.
a between the driven shaft 31b and the driven side shaft 31b can be disengaged according to the rotation direction of the former.

When the door 10 is opened, the one-way clutch 7
For example, when the main rotary shaft 2 rotates counterclockwise in FIG. 1, the rotation of the drive shaft side 31a driven via the large bevel gear 21 and the small bevel gear 22 is not transmitted to the driven side shaft 31b. Operate.

Conversely, when the door is closed, the one-way clutch 7 transmits the rotation of the drive shaft 31a to the driven shaft 31b. As the one-way rotation type clutch, for example, any conventionally known clutch such as a clutch having a ratchet pawl and a ratchet wheel, or a clutch having a roller fitted in an inclined hole can be used.

A first large gear 23 is mounted on the other end (left end in FIGS. 1 and 2) of the first support shaft 31, and a first large gear 23 is mounted on one end of a second support shaft 32 supported by the bracket 14. It is in mesh with the small gear 24.

The second large gear 25 mounted on the other end of the second support shaft 32 meshes with a second small gear 26 mounted on one end of a third support shaft 33 supported on the bracket 14. is there.

The third large gear 27 mounted on the other end of the third support shaft 33 is mounted on one end of a brake shaft 34 (brake shaft) supported on one end of the bracket 14 and the frame 1. It is meshed with the third small gear 28.

In the above configuration, the gear coupling structure from the large bevel gear 21 to the third small gear 28 forms a speed increasing mechanism,
The rotation of the main rotary shaft 2 is to rotate the brake shaft 34 at high speed via a four-stage gear speed increasing mechanism.

In the present invention, two brake mechanisms, that is, a first brake mechanism 8 and a second brake mechanism 9 are provided on the same axis of a brake shaft 34 which is an output shaft of the gear speed increasing mechanism.

The first brake mechanism 8 includes a conductor 81 and a conductor 8 made of a nonmagnetic material fixed to the output shaft 34.
Fixed permanent magnets 8 forming a pair in a positional relationship sandwiching 1
3,85.

The first brake mechanism 8 in the illustrated example will be described in more detail with reference to FIGS. 1 and 3. More specifically, a brake cup 81 having at least a skirt portion 81a made of a conductive material.
Are fixed to the output shaft 34 (brake shaft), and the first magnet holder 82 and the second magnet holder 84 are arranged on the outer surface and the inner surface of the skirt portion 81a of the brake cup 81 so as to be close to each other. I have.

In the outer cylindrical first magnet holder 82, six outer magnets are alternately arranged in the circumferential direction with the uppermost portion in FIG. 83 is attached.

On the other hand, the inner cylindrical magnet holder 84
In FIG. 3, six magnetic poles 8 are arranged such that different magnetic poles are alternately arranged in the circumferential direction with the uppermost part in FIG.
5 is attached.

In FIG. 3, each of the magnets 83 and 85
Is magnetized in the radial direction of the brake cup 81, and the S pole and N pole are indicated by the magnetic poles facing the skirt portion 81a.

The inner cylindrical second magnet holder 84 is fixed to the frame 1. On the other hand, the outer cylindrical first magnet holder 82 is the second magnet holder 8.
4 so as to be rotatable.

The movable first magnet holder 82 is provided with a sector gear 82a on a part of its outer periphery, and the sector gear 82a is rotatably supported on one end of the frame 1. A fixed small gear 87 is engaged with the operating shaft 86.

Therefore, the operating shaft 8 protruding from the frame 1
When one end of 6 is rotated by a tool such as a screwdriver, the relative angular position of the first magnet holder 82 in the circumferential direction with respect to the fixed second magnet holder 84 can be changed.

In the arrangement of the magnetic poles shown in FIG. 3, magnetic lines of force pass between the outer magnet 83 and the inner magnet 85, and the magnetic lines of force are orthogonal to the running direction of the skirt 81a of the brake cup 81. Therefore, the skirt 8 made of conductive material
An induced current flows through 1a, and a so-called eddy current is generated.

The eddy current is generated by the skirt 81 for cutting off the magnetic flux.
Since the brake cup 81 acts so as to prevent the rotation of a, the brake cup 81 receives a braking force.

Since the braking force is amplified by the gear speed increasing mechanism and transmitted to the main rotating shaft 2, when the door is turned from the open state to the closing direction, the door is slowly closed by receiving the braking force. The rotation of the door in the closing direction is buffered.

In the arrangement of the magnetic poles shown in FIG. 3A, since the N pole or S pole of the outer magnet 83 is directly opposed to the S pole or N pole of the inner magnet 85, the magnetic flux density of the line of magnetic force passing through the skirt 81a Is the largest.

When the operation shaft 86 is rotated to displace the first magnet holder 82 slightly clockwise as shown in FIG. 3B, the outer magnet 83 and the inner magnet 85 become part of each. Are opposed to each other with the same polarity and repel each other, and in this portion, the magnet wire passing through the skirt portion 81a disappears, so that the number of magnetic force lines as a whole decreases.

As a result, the induced current generated by the running (rotation) of the skirt portion 81a is reduced as compared with the state shown in FIG. 3A, and the braking force is reduced. In short, in the first brake mechanism 8, the braking force can be adjusted (adjusted) by rotating the operation shaft 86.

On the other hand, as shown in FIG. 1 and FIG. 4, the second brake mechanism 9 has a front circular substrate 91 fixed to the output shaft 34 (brake shaft). The brake pieces 93, 93 made of a plurality of abrasion-resistant materials or the like whose base ends are pivotally connected to a horizontally protruding pivot 92 are provided.
Is provided.

A receiving cylinder 94, which is fixed along the outer peripheral edge of the rotating substrate 91 with a gap therebetween and is integral with the first magnet holder 82, is provided outside the rotating substrate 91.

Further, the contact portion 93a on the tip end (free end) side of the rotating board 91 is kept in a non-contact state with the inner surface of the receiving cylinder 94 in a normal state (when not in operation) with respect to each control piece 93. When the substrate 91 rotates at a predetermined rotation speed or more, the braking piece 93
A control spring 95 is provided to allow the outward swing of the control spring.

In the illustrated example, the receiving cylinder 94 also serves as the cylindrical first magnet holder 82 and is formed integrally therewith, but it may be fixed separately. Further, a wear-resistant material may be applied to the inner surface of the receiving cylinder 94 in order to prevent the plurality of brake pieces 93 from being worn when the brake pieces 93 slide.

As shown in FIG. 4, the second brake mechanism 9 in the illustrated embodiment has a pair of brake pieces 93 pivotally attached to the rotating board 91, and the brake pieces 93, 93 and the gear speed increasing mechanism. A control spring 95 to be bridged between the output shaft 34 (brake shaft) and the output shaft 34 is one common member.

Then, the control spring 95 makes the wire meander in the same plane, forms a plurality of U-shapes in a waveform as if they were continuous with each straight part, and clamps the output shaft 34 at the center. For this purpose, arcuate mounting portions 95a, 95a facing each other in a pair may be provided.

Unlike the case where the coil spring is pulled, the control spring 95 exhibits elasticity as a reaction force against a bending moment acting in a direction in which the wire (element wire) is bent. It is well known that the elasticity of the coil spring exhibits a stress with respect to the twisting force of the strand.

In FIGS. 4A and 4B, reference numeral 96 is used.
Denotes a spring hook pin fixed to the tip of each brake piece 91;
a is an annular fitting groove formed along the circumference of the output shaft 34 to fit the central mounting portions 95a, 95a of the control spring 95, and 95b, 95b are spring stoppers provided at both ends of the control spring 95. .

In the illustrated example, the two brake mechanisms 8 and 9 are provided on the output shaft 34 in the order of the second brake mechanism 9 and the first brake mechanism 8 from the side closer to the gear speed increasing mechanism. The arrangement is reversed and the first brake mechanism 8 and the second
The order of the brake mechanism 9 may be adopted.

In the illustrated example, the one-way clutch 7
Although provided on the first support shaft 31, it may be provided on any rotation shaft of the door closer as long as it is located in front of the first brake mechanism 8 and the second brake mechanism 9.

Next, the operation of the door closer of the present invention as a whole will be described. 1 and 2, the door 10 is in a closed state. When the main rotating shaft 2 is rotated, for example, in the direction of arrow P in FIG. 1 through a linkage arm (not shown) when the door is opened from the closed state, the slider 4 is opposed to the return spring 5 by the engagement of the pinion 3 and the rack 6. 1 displaces rightward (arrow Q).

At this time, due to the presence of the one-way clutch 7,
Since the transmission of the rotation of the main rotation shaft 2 is interrupted on the way, the first brake mechanism 8 and the second brake mechanism 9 keep the non-operating state, and do not become resistance to the rotation of the main rotation shaft 2. Therefore, the door 10 can be opened relatively lightly.

When the hand is released from the door 10, the return spring 5 is released.
The slider 4 moves leftward in FIG. 1 (in the direction opposite to the arrow Q) due to the elasticity of the main rotating shaft 2 in the direction opposite to the arrow P via the rack 6 and the pinion 3, and The linkage arm operated by the shaft 2 moves back, closing the door.

At this time, the one-way clutch 7 is engaged, and the rotation of the main rotary shaft 2 is increased by the gear speed increasing mechanism while the output shaft 3 is rotated.
4 (brake shaft).

The first brake mechanism 8 of the rotating output shaft 34
Presents a braking force at all times, so that the energy applied from the return spring 5 is partially absorbed by the first brake mechanism 8 unless a strong tailwind is blown against the door 10,
The door 10 is closed while being buffered.

When the output shaft 34 (brake shaft) and the rotating board 91 rotate at a speed less than a predetermined number of revolutions, the second brake mechanism 9 on the rotating output shaft 34 swings due to the centrifugal force of the braking piece 93. Is suppressed by the control spring 95, and the braking piece 93 does not come into contact with the receiving cylinder 94, so that no braking force is exerted.

If a relatively strong wind is blown to the door as a tailwind when the door 10 is closed, the first brake mechanism 8 alone will have insufficient buffering power, and the rotation speed of the output shaft 34 (brake shaft) will increase. When the number of rotations exceeds a predetermined value, the free end of the brake piece 93 of the second brake mechanism 9
Tilting against the inner surface of the receiving cylinder 94 to exert the braking force of the second brake mechanism 9, so that the door 10 is closed quietly even in a strong wind.

[0056]

According to the door closer according to the present invention described above, only the first brake mechanism operates in the normal state where there is almost no wind when the door is closed, and the first brake mechanism operates when the strong wind blows on the door as follow-up wind. Second in addition to the brake mechanism
Since the brake mechanism is operated together, there is an effect that the closing force of the door can be appropriately controlled regardless of the magnitude of the wind blowing on the door.

Further, according to the second aspect of the present invention, the second brake mechanism can be manufactured to be small in size as a whole, and in particular, it can be manufactured to be thin in the rotation axis direction.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a door closer according to the present invention.

FIG. 2 is a side view showing a state where a cover plate is removed and a part of a frame is cut away.

FIGS. 3A and 3B are explanatory views in which the first brake mechanism in the door closer of FIG. 1 is viewed from the front as a cross section, where FIG. 3A is a view before adjustment and FIG. 3B is a view after adjustment.

FIG. 4A is a second view of the door closer shown in FIG. 1;
FIG. 3B is an enlarged front view of the control mechanism taken out from the second brake mechanism.

[Explanation of symbols]

 Reference Signs List 10 Door 1 Frame 2 Main rotating shaft 3 Pinion 34 Output shaft 4 Slider 5 Return spring 6 Rack 7 One-way clutch 8 First brake mechanism 83 Magnet 85 Magnet 9 Second brake mechanism 91 Rotating board 92 Axis 93 Braking piece 93a Contact portion 94 Receiving cylinder 95 Control spring 95a Mounting part

Claims (2)

[Claims] 1. A hollow frame attached to a door or a door frame, a slider guided movably in a longitudinal direction within the frame, a return spring for urging the slider toward a normal position, and a slider. A pinion that meshes with a rack formed on the side surface, a main rotation shaft that is rotatably supported by the frame, fixes the pinion, and has a linkage arm attached to a portion protruding outside the frame; and a main rotation shaft. A geared speed increasing mechanism, a one-way clutch provided on one of the rotating shafts, and a first brake mechanism and a second brake mechanism provided on the same axis as the output shaft of the gear speed increasing mechanism; The first brake mechanism includes a conductor fixed to the output shaft and a fixed magnet that forms a pair in a positional relationship to sandwich the conductor, and the second brake mechanism is fixed to the output shaft. Rotating board A plurality of braking pieces whose base ends are pivotally pivotally mounted on pivots protruding from the rotating board, a receiving cylinder fixed to the rotating board with a gap along the circumference of the rotating board, and each control piece, on the tip side. A contact spring is kept in a non-contact state with the receiving cylinder at normal times, and a control spring is arranged to allow the free end of the free end of the braking piece to tilt outward when the rotating substrate rotates at a predetermined rotation speed or more. A door closer characterized in that: 2. A control spring, which is bridged between a pair of braking pieces and an output shaft of a gear speed increasing mechanism, has a common control spring, and the control spring has a wire rod meandering in the same plane. 2. The door closer according to claim 1, wherein the door closer is formed in a shape, and has a pair of arc-shaped mounting portions opposed to each other in a pair at a central portion thereof so as to be clamped with respect to the output shaft.