JP3786228B2 - Joint device between arms in door closer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint device between arms in a door closer. More specifically, the present invention relates to a joint device that connects two arms in a door closer including a closer body, two arms, and a bracket.
[0002]
[Prior art]
An example of a conventional joint device of this type will be described with reference to FIG. The door closer shown in the figure is composed of a closer body 1, two arms 2, 3 and a bracket 4, and a joint device for connecting one arm 2 and the other arm 3 is an end portion of one arm 2. An end of the other arm 3 is fitted with a fitting hole through a bushing 92 made of an elastic polymer material with a flange around a projecting shaft 91 fixed to the arm.
[0003]
Further, a set screw 93 with a flange is screwed into a female screw hole at the tip end of the projecting shaft 91 so that the ends of the bush 92 and the other arm 3 do not come out.
[0004]
In the conventional joint device as described above, there are still points to be improved as follows. That is, for one thing, when the door closer is shipped from the factory, the two arms 2 and 3 are usually temporarily fixed. At the installation site of the door closer, both arms 2 and 3 are removed by removing the set screw 93. Once separated, the closer body 1 and the bracket 4 are fixed to the door 10 and the door frame 20, respectively, and then both arms 2 and 3 are coupled with the set screw 93 again.
[0005]
For this reason, it is difficult to unscrew and set the set screw, and there is a problem of loosening of the set screw during the use of the door closer.
[0006]
In addition, if the relative position in the vertical direction of the closer body 1 and the bracket 4 is deviated from the design value, the joint device will be twisted. Therefore, a horizontal rotation shaft 94 is usually provided at the tip of the arm 3 as shown in FIG. This helps to absorb the twisting.
[0007]
[Problems to be solved by the invention]
The joint device between the arms in the door closer according to the present invention has been proposed to solve the above problems. That is, the present invention eliminates the use of set screws in the connection between the arms, improves workability, solves the problem of loosening of the screws, and further reduces the number of parts, thereby reducing the number of parts. It was proposed for the purpose of absorption.
[0008]
[Means for Solving the Problems]
To achieve the above object, the coupling device according to claim 1 according to the present invention, Ru is provided a protrusion shaft with closer body, the one arm end portion of the door closer comprising comprises two arms and the bracket and the spherical portion In addition, an inner side of a bush made of an elastic polymer material having a small-diameter portion on both sides of the spherical surface portion in the axial direction of the projecting shaft and having a cylindrical body portion and a flange portion integrally formed at one end thereof A spherical receiving portion that is movably in contact with the spherical portion, and on the other hand, a fitting hole that fits into the body of the bush is opened at the end of the other arm of the door closer, The ends of the two arms are pivotably connected, and the length of the body of the bush is set to be larger than the thickness of the end of the other arm, and the extension of the body corresponds to the bush The end portion outer peripheral surface to form a protrusion to prevent the coming off of the end of the other arm, also at both ends of the bush, along its generatrix, at least one cutting out protruding portion of the flange portion and the body portion, respectively When a slit is formed so that the flange portion can be easily expanded when the bush is fitted to the protruding shaft from one end thereof, and the other end of the bush is pushed into the fitting hole of the other arm The other end of the bush is elastically deformed inward so that it can easily pass through the fitting hole .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the drawings.
1 and 2, reference numeral 2 denotes one arm whose other end is movably attached to a closer body or a bracket (not shown), and 3 denotes the other end is a bracket or a closer body (not shown). The other arm movably attached, 6 is a projecting shaft which will be described in detail later, and 7 is a bush which will also be described in detail later.
[0010]
One arm 2 has an insertion guide portion 61 for fitting a bush 7 described later in order from the distal end side, an outwardly projecting spherical surface portion 62, a main body portion 63, an attachment flange portion 64, and an attachment portion. The projecting shaft 6 composed of the small-diameter portion 65 is fixed by caulking or any other fixing means.
[0011]
The portions 61, 62, 63, 64, and 65 of the projecting shaft 6 are usually made integrally as a whole, but the spherical surface portion 62 and the flange portion 64 may be manufactured separately from the main body portion 63. it can.
[0012]
A bush 7 made of a polyamide resin or other elastic polymer material having a relatively large hardness is fitted around the protruding shaft 6 in a movable state.
[0013]
Inside the bush 7 (inner surface portion), there is a receiving portion 72 having a concave spherical shape, and this receiving portion 72 is movably in contact with the spherical portion 62 of the projecting shaft 6. Accordingly, the bush 7 can be rotated about the axis of the projecting shaft 6, that is, rotated in the vertical direction with play s in addition to the horizontal rotation.
[0014]
One end side (lower end side) in the length direction (axial direction) of the body portion 71 of the bush 7 is provided with a flange portion 73 formed integrally or made of a separate metal or the like.
[0015]
The length of the body 71 in the bush 7 (the length of only the body 71 excluding the flange 73) is greater than the thickness of one end of the other arm 3 fitted into the body 71 with the fitting hole 31. An annular protrusion 74 having a mountain-like vertical cross section is integrally formed around the extended portion 71a of the body 71 to prevent the end of the other arm 3 from coming off. It is formed.
[0016]
The flange portion 73 and the protruding portion 74 can be provided continuously or intermittently along the outer periphery of the bush 7.
[0017]
On the other hand, a circular fitting hole 31 is provided at one end of the other arm 3, and one end of the other arm 3 is fitted around the bush body 71 with the fitting hole 31. The flange part 73 and the protrusion part 74 are prevented from coming out while being sandwiched from above and below.
[0018]
Usually, the bush body 71 and the end of the other arm 3 fitted to the bush body 71 are fixed to each other so as not to rotate, but the other arm 3 rotates around the bush body 71. Even if it moves, it will not interfere with the operation of the door closer as a whole.
[0019]
In the figure, reference numerals 74a and 74b respectively indicate an outer slope and an inner slope across the ridge line of the protrusion 74 of the bush 7, and the former outer slope 74a is the other arm 3. The connecting portion between the inner inclined surface 74b and the bush 71 penetrates from the fitting hole 31 of the other arm 3 and expands to the outside. Since it opens, the bush 7 is prevented from coming off.
[0020]
Furthermore, at least one slit 75 and / or 76 is formed at each end or one end in the length direction (axial direction) of the bush 7.
[0021]
These slits 75, 76 are used when the bush 7 is fitted around the protruding shaft 6 of one arm 2 or removed therefrom, or when the other arm 3 is fitted around the bush 7 with the fitting hole 31 or removed therefrom, This is to facilitate elastic deformation of the bush 71 and the protruding portion 74 so that the attachment and detachment can be easily performed.
[0022]
In the embodiment, four slits 75 and 76 are provided at both ends in the length direction of the bush 7 at intervals of 90 °. In other words, both ends in the length direction of the bush 7 are divided into four parts.
[0023]
A slit 75 on one end side of the bush 7 [lower end side in FIGS. 2B, 2D and E] and a slit on the other end side [upper end side in FIGS. 2B, 2D and 2E] 76 is extended to reach the maximum inner diameter position of the receiving portion 72 that is spherical in shape in the length direction, and is formed so as to be shifted from each other by 45 ° in terms of angle.
[0024]
Although not shown in the drawing, the spherical surface portion 62 of the projecting shaft 6 of one arm 2 is made to be an outwardly concave spherical shape opposite to that of the illustrated example, and the spherical receiving portion of the bush 7 is made corresponding thereto. The portion 72 may be convex inward and spherical.
[0025]
Next, in the joint device between arms of the illustrated example according to the present invention, an outline of the assembly will be described.
[0026]
In order to fit the bush 7 made of an elastic polymer material to the projecting shaft 6 of one arm 2, the bush 7 is forced in the axial direction of the projecting shaft 6 as shown by an arrow P in FIG. Push into.
[0027]
Here, the bush 7 is fitted into the projecting shaft 6 while expanding one end side due to its own elasticity and the presence of the slit 75 on one end side (lower end side). As shown in FIG. When the receiving portion 72 having the spherical shape and the spherical portion 62 of the projecting shaft 6 are matched with each other, the mounting is completed, and the one end side of the bush 7 in the expanded state returns to the original state due to its elasticity.
[0028]
In order to fit one end of the other arm 3 into the one having the bush 7 attached to one arm 2 as described above, the arm 3 is fitted as shown by an arrow Q in FIG. The hole 31 is forcibly pressed so as to be fitted to the outside of the bush 7.
[0029]
Here, the bush 7 has its own elasticity and the presence of the slit 76 on the other end side (upper end side), so that the other arm 3 is closed and closed as shown in FIG. 4 is allowed, and as shown in FIG. 4C, the fitting hole 31 of the other arm 3 exceeds the projecting portion 74 of the bush 7 so that one surface (lower surface) of the arm 3 contacts the flange portion 73. When the contact is made, the mounting is completed, and the other end side (extended portion) of the bush 7 which has been in the contracted state returns to the initial state due to its elasticity.
[0030]
FIG. 1 shows a spherical surface between the projecting shaft 6 on one arm 2 and the bush 7 unless a particularly large vertical force is applied to the joint device in the assembled state of FIG. The mounting state is maintained by the fitting of the part 62 and the receiving part 72, and the mounting state is maintained between the bush 7 and the other arm 3 due to the presence of the protrusion 74 having a diameter larger than the diameter of the fitting hole 31. Retained.
[0031]
When the door closer is operated, the relative displacement (swinging motion) applied to the two arms 2 and 3 in the horizontal direction is fixed to the spherical surface 62 of the projecting shaft 6 of one arm 2 and the other arm 3. This is permitted by the relative sliding action in the horizontal direction between the receiving bush 72 and the mounted bush 7.
[0032]
Further, in the long-term use of the door closer, the twisting action between the two arms 2 and 3 caused by the door hanging down or the like causes the one arm 2 against the receiving portion 72 in the bush 7 fixedly attached to the other arm 3. It is absorbed by the sliding action in the vertical direction based on the play s of the spherical surface portion 62 on the projecting shaft 6 and the elastic action of the bush 7.
[0033]
【The invention's effect】
Since the joint device between the arms in the door closer according to the present invention described above has eliminated the set screw, the attachment / detachment between the two arms via the bush can be performed only by pushing and pulling operations, and the manufacturing factory In addition, workability can be improved at the installation site.
[0034]
For the same reason, not only can the problem of loosening of the screw of the joint device during use of the door closer be eliminated, but also the number of parts can be reduced.
[0035]
Furthermore, since the joint device constitutes a kind of universal joint by joining the spherical surfaces, there are various effects such as the ability to absorb the twist of the joint device due to the relative displacement of the bracket and the closer body in the vertical direction.
[Brief description of the drawings]
FIGS. 1A and 1B are diagrams showing a main part in an embodiment of a joint device according to the present invention, in which FIG. 1A is a front view, and FIG.
2A and 2B are diagrams showing the bush removed from the joint device of FIG. 1, wherein FIG. 2A is a plan view, FIG. 2B is a front view, FIG. 2C is a bottom view, and FIG. 2D is an IID in FIG. A vertical front view taken along the line IID, (E) is a cross-sectional view taken along the line IIE-IIE in FIG.
FIGS. 3A and 3B are explanatory views sequentially showing a process of fitting a bush into a projecting shaft of one arm in the assembly of the joint device shown in FIG. 1;
4 (A) to (C) sequentially show the process of fitting the other arm with the fitting hole to the bush assembled to the projecting shaft of one arm in the assembly of the joint device shown in FIG. 1; Explanatory drawing.
FIG. 5 is a front view illustrating a joint device between arms in a conventional door closer in an in-use state.
[Explanation of symbols]
2 One arm 3 The other arm 6 Projection shaft 62 Spherical surface portion 7 Bush 71 Body portion 71a Extension portion 74 Projection portion 75 Slit 76 Slit

Claims (1)

Closer body, Rutotomoni provided projecting shaft having a spherical surface portion on one of the arm end of the door closer comprising comprises two arms and the bracket, respectively small diameter portion is formed on both sides of the spherical portion in the axial direction of the projecting shaft, On the other hand, on the inside of the bush made of an elastic polymer material having a cylindrical body portion and a flange portion integrally formed at one end thereof , a spherical receiving portion that is movably in contact with the spherical surface portion is formed, The other end of the door closer is formed by opening a fitting hole that fits with the body of the bush, and the ends of the two arms are rotatably connected via the bush. The length of the body part of the bush is set larger than the thickness of the end part of the other arm, and the end part of the other arm protrudes from the outer peripheral surface of the other end part of the bush corresponding to the extended part of the body part. Shape blocking protrusion And, also, the both ends of the bushing, respectively along its generatrix, the flange portion and forming at least one slit notched protrusions of the body, other than Te, fitting the bushing from one end to the projecting shaft When the other end of the bush is pushed into the fitting hole of the other arm, the other end of the bush is elastically deformed inward so that it can easily pass through the fitting hole. coupling device between the arms in the door closer, characterized in that the.

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