JPH0562190B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a door closer that automatically closes an open door, and specifically to a mechanical door closer.

(Conventional technology) The most popular door closers are:
This oil-type door closer has a piston slidably inserted into a cylinder containing a spring and oil, which charges the spring when the door is opened, and uses the flow resistance of the oil to create a damper when the door is closed. It has an effect. This oil-type door closer has problems such as oil leakage and fluctuations in closing speed due to changes in temperature, and mechanical door closers have solved these technical problems. Mechanical door closers store energy in a biasing means such as a coil spring or the like when opening a door, and use this stored force when closing the door. In this system as well, it is necessary to provide a damper effect when the door closes, and a gear train connects a member that is interlocked with the closing operation of the door and a braking means.

(Problems to be Solved by the Invention) Mechanical door closers have solved the problems of oil leakage and fluctuations in door closing speed, but the mechanical door closers do not require a gear train to connect the braking means and the members that are linked to the opening and closing of the door. Therefore, noise occurs as the gear train rotates. If a metal gear train is supported by a metal frame in order to maintain strength and durability, rotation noise will occur early, and over time, high noise will occur due to wear of both parts. This noise is particularly problematic in the case of door closers installed in places where quietness is required.

(Means for Solving the Problems) The present invention aims to provide a door closer that solves the problems of the mechanical door closers described above, and includes an input shaft that rotates in conjunction with opening and closing of the door, and an input shaft that rotates in conjunction with opening and closing of the door. a slider that moves according to the rotation of the slider; a biasing means that stores energy when the slider is moved in the door opening direction to bias the slider in the door closing direction; and a biasing means that biases the slider in the door closing direction. A gear train for increasing the moving speed of the slider to be moved, the gear train including at least one metal gear, and a gear train connected to the speed increasing gear train to brake the rotation of the input shaft. It consists of a braking means for engaging, a metal support member that rotatably supports the metal gear, and a synthetic resin member interposed between the metal gear and the metal support member.

(Function) When the door is opened, the input shaft rotates and moves the slider in the door opening direction. When the slider moves, the biasing means is energized. When the action to open the door is released, the slider, which is biased by the biasing means and moves, rotates the input shaft and closes the door. The movement of the slider that moves at this time is transmitted to the speed-increasing gear train to actuate the braking means to brake the rotation of the input shaft, that is, the closing of the door. The metal gear supported by the metal support member in the speed increasing gear train is
It is rotated via a synthetic resin member.

(Example) Hereinafter, the present invention will be described in detail based on the illustrated example.

FIG. 1 shows an example of a retractable door closer, and the door closer 1 includes a frame 2,
It consists of an input shaft 3 which is rotatably supported by the frame and has an end protruding from the frame, and each component to be described later. Frame 2 is door D
It is stored and fixed in a storage part formed at the upper end (see FIG. 2). On the other hand, a guide rail 4 having a U-shaped cross section is fixed to a door frame (not shown). A slider 5a pivotally attached to one end of an arm 5 is slidably fitted into the guide rail 4. The other end 5b of the arm 5 has a square hole 5c formed therein connected to the protruding end of the input shaft 3.

In FIGS. 3 and 4, a frame 2 formed by pressing a metal plate is composed of a frame 2a and a frame 2b that are overlapped with each other.

An input shaft 3 whose rotation center axis extends vertically is disposed approximately in the center of the frame 2 . The input shaft 3 has a bearing 9 fixed to the frame.
9 is rotatably supported. Ends 3a and 3b of the input shaft 3 protruding from the frame are formed into square shafts, and an arm 5 (a first
(see figure) is engaged with the square hole 5c. The input shaft 3 is formed with a toothed portion 3c and a cylindrical portion having a diameter substantially equal to the tip circle of the toothed portion.

A metal slider 11 is slidably provided on the frame 2. Slider 11 has
a rack portion 11a that meshes with the tooth portion 3c of the input shaft;
Cam portions 11b that abut against transmission gears, which will be described later, are respectively formed. A spring seat 11c is fixed to the end of the slider 11 opposite to the cam portion 11b, which receives one end of a spring 12 as a biasing means. A spacer 13 made of synthetic resin is provided between the inner surface of the frame 2 made of sheet metal and the slider 11 to reduce the sliding resistance between the metal members.

Two springs 12 are arranged vertically in parallel, and the other end is supported by a receiving plate 14. The receiving plate 14 is supported at both ends by stays 15 fixed to the frame 2.

Inside the frame 2, there is a cam portion 1 of the slider 11.
1b, a transmission gear 18 formed with a cam part 18a and a tooth part 18b, a speed-increasing gear train 19 that increases the moving speed of the slider, and a worm shaft 20 that meshes with the final stage of the speed-increasing gear train 19. A brake means 21 provided on the worm and a clutch means 22 for transmitting only the movement of the slider 11 in the door opening direction to the brake means 21 are housed.

The speed increasing gear train 19 includes a transmission gear 18, a two-stage gear 23, a small diameter gear 24, and a worm wheel 25. These wheel trains each have a support shaft 2 as a metal support member arranged horizontally and caulked to the frame 2 at both ends.
It is rotatably supported by 6, 27, and 28. Support shafts 26 and 27 of the transmission gear 18 and the two-stage gear 23, which are made of metal gears, are provided with sleeves 26a and 27a, respectively, which are synthetic resin members.
is rotatably inserted. These sleeves 2
6a and 27a are made of a thermoplastic synthetic resin that has excellent wear resistance. Examples of synthetic resins exhibiting excellent properties in terms of friction coefficient and wear resistance include polyacetal, polyamide, polyethylene, tetrafluoroethylene, and polyimide. In addition,
When the small diameter gear 24 and the worm wheel 25 supported by the support shaft 28 are made of a metal material, and the shaft is made of metal, a sleeve similar to the above may be fitted.

Furthermore, if the support shafts of the transmission gear 18 and the two-stage gear 23 are made of metal and are integrated with each gear, a bearing made of synthetic resin may be installed between the ends of these shafts and the frame 2. will be placed. In this case, it slides between the end of the support shaft and the synthetic resin bearing.

Transmission gear 18 is substantially integral with sleeve 26a. A return lever 29 is attached to the sleeve 26a.
are integrally fitted. This lever 29 is
Its tip 29a is engaged with a pin 30 fixed to the slider 11, and the transmission gear 18 is rotated in the opposite direction of the arrow c following the movement of the slider 11 when the door is opened. In addition, the return lever 29
Instead, the transmission gear 18 may be biased by a spring.

The two-stage gear 23 is a speed-increasing gear that includes a small-diameter tooth portion 23a that meshes with the tooth portion 18b of the transmission gear 18, and a large-diameter tooth portion 23b. A tooth portion 24a of a small-diameter gear 24 meshes with the large-diameter tooth portion 23b.

The small diameter gear 24 and the worm wheel 25 constitute clutch means. A sleeve 24b is formed on the small diameter gear 24 and locks one end 31a of a coil spring 31 wound around the sleeve 24b. The worm wheel 25 has teeth 25b formed on the outer peripheral surface of a sleeve 25a surrounding the sleeve 24b. The coil spring 31 is given an expanding tendency to come into pressure contact with the inner circumferential surface of the sleeve 25a, and its free end 31b is free with respect to the sleeve 25a. When the small diameter gear 24 rotates in the direction of arrow a, the coil spring 31
By being tightly wound, the rotation of the sleeve 24b is not transmitted to the sleeve 25a. Small diameter gear 24
When rotates in the opposite direction to arrow a, at this time,
As the coil spring 31 expands, the sleeve 24b
The rotation is transmitted to the sleeve 25a, that is, the worm wheel 25. Therefore, the rotation of the transmission gear 18 is transmitted to the worm wheel 25 at an increased speed. It should be noted that the clutch means is not limited to the illustrated example, and other types of clutches that provide the above-mentioned effects may be employed.

The worm shaft 20 is rotatably supported at both ends by bearing members 32 and 33 fixed to the frame.

The braking means 21 includes a worm shaft 20, an arm portion 21a that is press-fitted onto the shaft and expands in the circumferential direction when the shaft is rotated at high speed, and an arm portion 21a that surrounds the arm portion and expands. The arm part includes a braking cup part 21b that slides on the inner circumferential wall of the arm part and applies a brake to the rotation of the worm shaft. In addition,
As the braking means, other types of governor mechanisms, such as a wind blowing type or an eddy current type, may be employed, but a worm shaft is used as the rotation center axis.

Now, the operation of the embodiment configured as above will be explained.

The door closer shown in FIGS. 3 and 4 is shown in a state where the door is opened approximately 90 degrees, as indicated by the symbol DA in FIG. In this state, the slider 11 is rotated by the teeth 3c of the input shaft 3 against the elasticity of the spring 12, with its non-slip portion facing the cylindrical portion of the input shaft. In this state, the spring 12 is biased and urges the slider 11 in the door closing direction b.
Further, at this time, the cam portion 11b of the slider 11 and the cam portion 18a of the transmission gear 18 are in abutment with each other.

Now, as shown in Figure 2, the door is opened approximately 90 degrees.
When the opening operation for DA is canceled, input shaft 3
is biased by spring 12 and arrow b
The rack part 11 of the slider 11 moves in the direction of
The tooth portion 3c is engaged with the tooth portion a and rotated counterclockwise. Rotation of the input shaft 3, via the arm 5 (see FIG. 1), pivots the door toward the closed position indicated by D in FIG.

When the slider 11 moves in the door closing direction,
The transmission gear 18, whose cam portion 18a abuts against the cam portion 11b, is rotated in the direction of arrow c (see FIG. 4). The rotation of the transmission gear 18 is transmitted to the small diameter gear 24 via the two-stage gear 23, which is driven to rotate in the direction opposite to the arrow a in FIG. 4. When the small diameter gear 24 rotates, its sleeve 24b expands the coil spring 31, causing the sleeve 25a integrated with the worm wheel 25 to rotate at high speed. That is, when the door is closed,
When the clutch means 22 is engaged, the worm wheel 25 rotates the worm shaft 20 at a high speed. When the worm shaft 20 rotates at high speed, the arm portion 21a expands due to centrifugal force and rubs against the inner peripheral surface of the cup portion 21b, thereby applying a brake on the rotation of the worm shaft 20. When the rotation of the worm shaft is braked, the speed increasing gear train 19 that drives the worm shaft is also braked. The braking applied to the speed increasing gear train 19 applies a brake to the rotation of the input shaft 3 meshing with the slider 11, and thus applies a brake to the rotation of the door that is rotating in the closing direction. Now, the braking of the braking means 21 is performed by the worm shaft 2.
When the rotation of the arm 21a decreases, the arm part 21a no longer rubs the cup part 21b, so that the arm part 21a is released. Therefore, when the rotation of the worm shaft increases, the braking action is started, and when the rotation decreases, the braking action is released. Of the speed increasing gear train 19 that increases the speed and transmits the movement of the slider 11 to the braking means, at least the transmission gear 18 which is a metal gear and the two-stage gear 2
3 is rotated via sleeves 26a and 27a made of synthetic resin.

Therefore, the friction between the metal gear rotated at high speed and the metal frame 2 is reduced, seizure and wear are suppressed, and rotation noise is also prevented. Furthermore, if the sleeves 26a and 27a are made of thermoplastic synthetic resin, the sleeves will melt in the event of a fire, and the rotation center axes of adjacent gears in the speed increasing gear train will fluctuate, causing the gears to mesh with each other. , and the rotational transmission between the slider moving in the door closing direction and the braking means 21 is released.
Therefore, the desired effect is that the door can be closed quickly without being subjected to braking.

As shown in FIG. 3, when the door is opened to 90 degrees, the tooth portion 3c of the input shaft 3 and the rack portion 11a are disengaged from each other. Therefore, the slider cannot be moved even if the door is opened any further. In other words, when the door is opened at an opening angle of 90° or more, as shown for example by the symbol DC in FIG. 2, the door can be stopped at any opening position. In FIG. 2, in order to close the door DC placed at an arbitrary position, the door is rotated to the position indicated by the symbol DA. Then, as shown in FIG. 3, the rack part 11c of the slider and the tooth part 3c of the input shaft 3 engage, so that the slider 11, which is biased by the spring 12, inputs the input in the direction to close the door. Axis 3
will be rotated. Note that when the door to be closed reaches the close position D indicated by the symbol DB in FIG.
The door is rotated rapidly to increase the braking action and slow down the closing speed of the door.

Although the illustrated embodiment is a door closer built into the door, the present invention may also be an external door closer fixed to the surface of the door.

(Effects of the Invention) As described above, according to the present invention, a bearing made of synthetic resin is interposed between a metal gear in a speed increasing gear train that rotates at high speed and a support member that supports it. Since wear of both is suppressed and no noise is generated due to the rotation of the gears, a door closer with long life and excellent quietness can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a door closer showing an embodiment of the present invention, Fig. 2 is a plan view showing a plurality of opening positions of the door, and Fig. 3 is a door of a door closer showing an embodiment of the invention. top sectional view in open position;
FIG. 4 is a longitudinal sectional view of the same as above. 1...Door closer, 3...Input shaft, 11...
...Slider, 12...Spring, 18, 23
... Metal gear, 19 ... Speed-increasing gear train, 20 ... Worm, 21 ... Braking means, 2, 26, 27 ...
Metal support members, 26a, 27a...synthetic resin members.

Claims (1)

[Claims] 1. An input shaft that rotates in conjunction with the opening and closing of the door; a slider that moves following the rotation of the input shaft; and an input shaft that stores energy when the slider is moved in the door opening direction. , a biasing means for biasing the slider in the door closing direction, and a gear train for accelerating the moving speed of the slider moved by the biasing means, the gear train including at least one metal gear. a wheel train; a braking means connected to the speed-increasing wheel train for braking the rotation of the input shaft; a metal support member rotatably supporting the metal gear; the metal gear and the metal; A door closer comprising a synthetic resin member interposed between a synthetic resin support member and a synthetic resin support member.