JPH01192976A - Door closer - Google Patents

Abstract

PURPOSE:To prevent the generation of noises by interposing a bearing section made of a synthetic resin between a metallic gear in a speed-increasing wheel row turned at high speed and a support member supporting the gear. CONSTITUTION:When the opening operation of a door is released, teeth for an input shaft 3 are engaged with a rack section 11a for a slider 11 energized by a spring 12 and moved in the direction of the arrow (b), and the input shaft is rotated in the counter-clockwise direction. A metallic transmission gear 18 for a speed-increasing wheel row 19 is turned in the direction of the arrow (c), double gears 23 are revolved through sleeves 26a, 27a made of a synthetic resin, and a small-diameter gear 24 is rotated in the direction of the arrow (a). A clutch means 22 is brought to the position of contact, and a worm wheel 25 turns and drives a worm shaft 20 at high speed. An arm section 21a is expanded and the inner circumferential surface of a cup section 21b is slid and rubbed, the revolution of the worm shaft 20 is braked, and the rotation of the door is braked.

Description

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

(Prior art) The most popular type of door closer is an oil-type door closer, in which a piston is slidably inserted into a cylinder containing a spring and oil, and the spring is charged when the door is opened. However, when the door is closed, the oil flow resistance is used to create a damper effect. This oil-type door closer has the problem of fluctuations in closing speed due to oil leaks and changes in temperature.Mechanical door closers have solved these technical problems. A biasing means such as a Zenrin or a coil spring is used to store energy, and this stored power is used 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.

(Problem M 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 connect the braking means and the members that are linked to the opening and closing of the door with a gear train. As a result, noise is generated 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, the gear train including at least one metal gear; and a brake connected to the speed increasing gear train for braking the rotation of the input shaft. - a metal support member rotatably supporting the metal gear; and a synthetic resin member interposed between the metal gear and the metal support member.

(Operation) 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. A metal gear supported by a metal support member in a speed increasing gear train.

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, an input shaft 3 rotatably supported by the frame, and an input shaft 3 whose end protrudes from the frame. It consists of each component described below. The frame 2 is stored and fixed in a storage portion formed at the upper end of the door D (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 consists 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 is rotatably supported by a bearing 9°9 fixed to the frame. End 3 of input shaft 3 protruding from the frame
a and 3b are formed into square shafts, and the square hole 5c of the arm 5 (see FIG. 1) is engaged with the end 3a. For input shaft 3.

A toothed portion 3c and a cylindrical portion having a diameter substantially equal to the tip circle of this toothed portion are formed.

A metal slider 11 is slidably provided on the frame 2. The slider 11 has teeth 3 on the input shaft.
A rack portion 11a that meshes with the transmission gear c, and a cam portion 11b that meshes with a transmission gear 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 a sheet metal layer and the slider 11 to reduce the sliding resistance between the metal surfaces.

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

Inside the frame 2, there is a transmission gear 18 formed with a cam portion 18a and a tooth portion 18b that abut against the cam portion 11b of the slider 11, and a speed increasing gear train 1 that increases the moving speed of the slider.
9, 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 closing 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. It consists of a worm wheel 25.

These columns are rotatably supported by support shafts 26, 27, and 28, each of which is a metal support member, which is horizontally arranged and whose both ends are caulked to the frame 2. Sleeves 26a and 27a, which are synthetic resin members, are rotatably fitted into support shafts 26 and 27 of the transmission gear 18 and the two-stage gear 23, which are made of metal gears, respectively. These sleeves 26a, 27a are made of thermoplastic synthetic resin and have excellent wear resistance. Synthetic resins that exhibit excellent friction coefficient and wear resistance include polyacetal, polyamide, and polyethylene.

Examples include tetrafluoroethylene and polyimide.

Note that 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.

Further, 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. In case of being placed.

It slides between the end of the support shaft and a synthetic resin bearing.

Transmission gear 18 is substantially integral with sleeve 26a. A return lever 29 is integrally fitted into the sleeve 26a. This lever 29 has its tip 29a engaged with a pin 30 that is equivalent to the slider 11, and rotates the transmission gear 18 in the opposite direction of arrow C following the movement of the slider 11 when the door is opened. let Note that instead of the return lever 29, 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. The large-diameter tooth portion 23b has a tooth portion 24 of the small-diameter gear 24.
a are engaged.

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 2 on the outer peripheral surface of a sleeve 25a surrounding the sleeve 24b.
5b is formed. The coil spring 31 is connected to the sleeve 2
The sleeve 5a is given an expansion habit in the direction of pressing against the inner circumferential surface of the sleeve 5a, and its free end 31b is free with respect to the sleeve 25a. and.

When the small diameter gear 24 rotates in the direction of the arrow a, the coil spring 31 is wound tightly so that the rotation of the sleeve 24b is not transmitted to the sleeve 25a.When the small diameter gear 24 rotates in the opposite direction to the arrow a, the coil spring 31 is tightened. 31 expands, the rotation of the sleeve 24b 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. In addition.

The clutch means is not limited to the illustrated example, and other types of clutches that can provide the above effects may be employed.

The worm shaft 20 has a bearing member 32 fixed to the frame.
．． 33, both ends of which are rotatably supported.

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 surrounds the arm portion.
The expanded arm part is composed of 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. Although other types of governor mechanisms, such as a wind blowing type or an eddy current type, may be used as the braking means, 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', as indicated by the symbol DA in FIG. In this state, the slider 11 is rotated by the toothed portion 3c of the input shaft 3 against the elasticity of the spring 12, and its non-rack portion is opposed to 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. 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 FIG. 2, when the opening operation for the door DA, which has been opened approximately 90'', is released, the input shaft 3 is biased by the spring 12 and moves in the direction of the arrow 11, at the rack portion 11a of the slider 11. The input shaft 3 is rotated counterclockwise by engaging its teeth 3c with the input shaft 3.
Via the arm 5 (see FIG. 1), the door is pivoted into the closed position indicated by the reference numeral in FIG.

When the slider 11 moves in the door closing direction, the transmission gear 1 causes the cam portion 18a to abut against the cam portion 11b of the slider 11.
8 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 2 via the two-stage gear 23.
4, and this is shown in FIG.

Rotate in the direction opposite to arrow a. 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, the clutch means 22 is engaged and the worm wheel 2
5 rotates the worm shaft 20 at high speed. When the worm shaft 20 rotates at high speed, the arm portion 21a expands due to centrifugal force, slides against the inner peripheral surface of the cup portion 21b, and rotates the worm shaft 2.
Apply braking to 0 rotation. The fact that the rotation of the worm shaft is braked means that the speed increasing gear train 19 that drives the worm shaft is braked.
Braking will be applied. 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 released when the rotation of the worm shaft 20 decreases and the arm portion 21a no longer rubs the cup portion 21b. Therefore, when the rotation of the worm shaft increases, the braking action is started, and when the rotation decreases, the braking action is released. The higher the rotational speed of the worm shaft 20, the shorter the period for the braking action becomes. 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 I8 and the two-stage gear 23, which are metal gears, are connected to the synthetic resin sleeve 2.
6a and 27a.

Therefore, 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.
The meshing of the gears is released, and rotational transmission between the slider moving in the door closing direction and the braking means 21 is canceled. Therefore, the effect that the door can be closed quickly without being subjected to braking can be expected.

As shown in Fig. 3, when the door is opened to 90'', the tooth portion 3C of the input shaft 3 and the rack portion 11a are disengaged. Therefore, even if the door is opened any further, the slider will not move. 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 a position indicated by the symbol DA.

Then, as shown in Fig. 3, the rack part 1 of the slider
1c and the toothed portion 3c of the input shaft 3 engage with each other, so that the slider 11, which is biased by the spring 12, then rotates the input shaft 3 in the direction to close the door. Note that when the door to be closed is about to reach the closed position shown by reference numeral DB in FIG. This increases the braking action and slows 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 the metal gear in the speed increasing train rotating at high speed and the 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,
FIG. 3 is a plan sectional view of a door closer showing an embodiment of the present invention in a door open position, and FIG. 4 is a longitudinal sectional view of the same. 1...Door closer-13...Input shaft, 11...
Slider, 12...Spring, 18.23...
Metal gear, 19... Speed-up transmission train, 20... Worm, 21... Braking means. 2.26.27...Metal support member, 26a, 27a
...Synthetic resin parts. ) Ama! ! Ray O (:1 Procedural amendment band 1. Indication of the case 1986 Patent Application No. 019030 2. Name of the invention Door closer 3. Person making the amendment Relationship to the case Patent applicant name Name (223) Sankyo Seiki Co., Ltd. Manufacturer 4, Agent address: 4-5-4 Kyodo, Setagaya-ku, Tokyo, Subject of amendment (1) "And" on page 13, line 1 of the specification, after "will be", and then "and" on the third line of the same page. (2) Change r18bJ to r18aJ on page 14, line 14. (3) Replace Figure 4 in the attached drawings with the attached sheet.

Claims (1)

[Scope of Claims] 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 increasing the moving speed of the slider moved by the biasing means, the speed-increasing gear train including at least one metal gear. , a braking means connected to the speed increasing gear train and braking the rotation of the input shaft; a metal support member rotatably supporting the metal gear; and the metal gear and the metal support member. and a synthetic resin member interposed between the door closer and the door closer.