JP3880711B2 - Joint device between arms in door closer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint device between two arms in a door closer. More specifically, the present invention relates to a joint device for connecting a main arm and an adjustment arm in a door closer comprising a closer body, a main arm, an adjustment arm and a bracket.
[0002]
[Prior art]
An example of this type of conventional joint device will be described with reference to FIG. The door closer shown in FIG. 1 is composed of a closer body 1, a main arm 2, an adjusting arm 3 and a bracket 4. A joint device for connecting the main arm 2 and the adjusting arm 3 is planted at the end of the main arm 2. The end of the adjustment arm 3 is fitted with its fitting hole through a bushing 92 made of an elastic polymer material with a flange around the provided projecting shaft 91.
[0003]
Further, a set screw 93 with a flange is engaged with a female screw hole at the tip of the projecting shaft 91 so that the ends of the bush 92 and the adjustment 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, and the two screws 2 and 3 can be removed by removing the set screw 93 at the installation site of the door closer. And the closer main body 1 and the bracket 4 are fixed to the door 10 and the door frame 20, respectively, and then the arms 2 and 3 are coupled with the set screw 93 again.
[0005]
Therefore, it is quite troublesome to unscrew and set the set screw, and there is also a problem of loosening of the set screw during use of the door closer.
[0006]
Further, if the relative position of the closer body 1 and the bracket 4 in the vertical direction deviates from the design value, the joint device will be twisted. Therefore, a horizontal rotation shaft 94 is usually provided at the tip of the adjustment 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 in order to solve the problems related to the set screw. In other words, the present invention eliminates the problem of screw loosening by eliminating the use of a set screw in the connection between arms, and improves workability by allowing one-touch connection with a hand without using a tool. It was proposed for the purpose of measuring.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a joint device according to the present invention includes an arm pin that is implanted at the tip of a main arm, has a tapered portion at the top, and has a groove formed in the middle of the cylindrical portion, and an arm pin. A hollow cylindrical arm pin bushing that is pivotably fitted to the cylindrical part and has a pair of arc-shaped grooves symmetrically about the central axis at an intermediate position in the axial direction, and rotatable at the tip of the adjustment arm A bifurcated bush holder that is mounted and holds the arm pin bush from the outside and has a notch formed in the middle of the width direction except for the flat surface, and coaxially with the bush holder at the tip of the adjustment arm. It is mounted so as to be pivotable, and engages by holding the small diameter part of the arm pin from both sides. And having a bifurcated clip resilient constrained to notch the loaders.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the drawings.
1 to 7, reference numeral 2 is a main arm having the other end rotatably attached to the closer body 1, reference numeral 3 is an adjusting arm having the other end rotatably attached to the bracket 4, and reference numeral 5 is a main arm. Each of the arm pins implanted at the tip of the arm is shown.
[0010]
The arm pin 5 is formed with a tapered portion 51, a cylindrical portion 52, a flange portion 53, and a mounting portion 54 in order from the top (upper end in FIG. 1) along the length direction.
[0011]
A groove 52a having an outer diameter smaller than the outer diameter of the cylindrical portion is formed in the middle of the cylindrical portion 52 in the axial direction.
[0012]
The attachment portion 54 is inserted into the attachment hole 2a projecting from the end portion of the main arm 2 and then implanted into the main arm by a method such as caulking.
[0013]
At this time, it goes without saying that the lower surface of the flange portion 53 is in close contact with the upper surface of the main arm 2 so that the arm pin 5 is fixed vertically and firmly to the main arm.
[0014]
1 to 7, reference numeral 6 denotes an arm pin bush, reference numeral 7 denotes a bush holder, and reference numeral 8 denotes a clip.
[0015]
The arm pin bush 6 is formed of a hollow cylinder 61, and the inner diameter thereof is set to be slightly larger than the outer diameter dimension of the cylindrical portion 52 of the arm pin so that it can be fitted without looseness. The length of the cylinder 61 is substantially equal to the sum of the lengths of the taper portion 51 and the cylinder portion 52 of the arm pin.
[0016]
Further, in the middle of the axial direction of the side wall of the cylinder 61, two notches 61a and 61a that are long in the circumferential direction are formed symmetrically with respect to the central axis.
[0017]
Therefore, the upper and lower portions of the cylinder 61 are connected by the two posts 61b and 61b remaining between the grooves. (See Figures 1, 4, and 5)
[0018]
On the other hand, the bush holder 7 is a bifurcated one composed of a flat portion 71 and a cylindrical portion 72, and the cylindrical portion 72 has an inner diameter that is slightly larger than the outer dimension of the arm pin bush 6. It is comprised so that an arm pin bush can be hold | maintained to.
[0019]
Further, a connecting hole 71a is formed at the tip of the flat portion 71, and is attached rotatably by a horizontal pin 9 passing through a holding hole 3a drilled at the tip of the adjusting arm 3 together with a clip 8 described later.
[0020]
Further, a notch 72a is formed in the middle of the width direction (vertical direction in FIG. 1) from the cylindrical portion 72 to the flat surface portion 71 of the bush holder 7, and the notch 72a holds the arm pin bush 6 when The positional relationship is aligned with the notch 61a.
[0021]
On the other hand, the clip 8 is made of an elastic stainless steel thin plate, for example, and has a bifurcated shape composed of a pair of mounting portions 81 and 81, a cylindrical portion 82 and a bridge portion 83 which are parallel to each other.
[0022]
A connecting hole 81a is opened at the end of the mounting portion 81, and penetrates the connecting hole and the holding hole 3a of the adjusting arm in a state of overlapping with the connecting hole 71a of the bush holder 7 from the outside. A horizontal pin 9 is rotatably attached to the tip of the adjustment arm 3 (see FIG. 3).
[0023]
The inner diameter of the cylindrical portion 82 of the clip is substantially equal to the outer diameter of the groove 52a of the arm pin 5, and the width of the cylindrical portion is slightly smaller than the width of the groove.
[0024]
Therefore, when the clip 8 is engaged with the arm pin 5, the cylindrical portion 82 of the clip is in a state of holding the groove 52a of the arm pin 5 from both sides. (See Figs. 4 and 5)
[0025]
Further, the bridge portion 83 of the clip 8 forms an arc with the same width as the cylindrical portion 82 to connect the cylindrical portions 82 on both sides, and when a large external force in the radial direction is applied to the cylindrical portions 82, 82, The part is elastically deformed so that the part can be easily expanded.
[0026]
Furthermore, the width of the notch 61a of the arm pin bush 6 and the notch 72a of the bush holder described above is slightly larger than the plate width of the cylindrical portion 82 and the bridge portion 83 of the clip 8, and therefore the clip 8 is When engaged with the notch, the movement in the width direction (vertical direction in FIG. 2) is restricted by the notch 72a of the bush holder.
[0027]
In the joint device according to the present invention configured as described above, first, the attachment portion 54 of the arm pin 5 is inserted into the hole 2a at the tip of the main arm 2, and the attachment portion 54 is in close contact with the main arm. The arm pin 5 is fixed to the tip of the main arm 2 by caulking the lower end surface of 54.
[0028]
On the other hand, the connecting hole 71a of the bush holder 7 is aligned with the holding hole 3a at the end of the adjusting arm 3 from the outside.
[0029]
Next, the arm pin bush 6 is pushed into the cylindrical portion 72 of the bush holder 7 from above or below, so that the notch 61a of the arm pin bush and the notch 72a of the bush holder are aligned.
[0030]
After that, as shown in FIG. 1, the clip 8 is inserted from the right side of the bush holder 7, and the cylindrical portion 82 and the bridge portion 83 of the clip are slid into the notches 61a and 72a of the bush 6 and the bush holder 7, 81 a is matched with the holding hole 3 a of the adjusting arm 3.
[0031]
When the holding hole 3a and the connecting holes 71a and 81a are aligned, the horizontal pin 9 is inserted into each hole in common and the tip of the horizontal pin 9 is crimped.
These processes are performed at the factory, and when shipping the door closer to the installation site, the main arm 2 to which the arm pin 5 is attached and the adjustment arm 3 to which the arm pin bush 6, the bush holder 7 and the clip 8 are attached are temporarily set. Leave it as it is.
[0033]
That is, at this time, the cylindrical portion 82 of the clip 8 having an inner diameter smaller than the inner diameter of the arm pin bush faces the notch 61 a of the arm pin bush 6. It cannot be fitted to the outer shape of the cylindrical portion 52, and is in a temporarily placed state as shown in FIG.
[0034]
Since the joint device of the door closer carried to the installation site in this state can be easily disassembled, the door closer main body 1 and the bracket 4 are attached to the door 10 and the door frame 20, respectively.
[0035]
After the attachment of the closer body 1 and the bracket 4 is completed, the coupling device is easily assembled by the method described below.
[0036]
First, the temporary placement state shown in FIG. 6 is set. That is, the arm pin bush 6 in the bush holder 7 attached to the adjustment arm 3 is aligned with the upper part of the arm pin 5 planted in the main arm 2.
[0037]
Next, a downward force is applied to the bush holder 7. Then, since the tapered portion 51 is formed at the tip of the arm pin 5, the tapered portion widens the cylindrical portion 82 of the clippy 8 by the wedge action, thereby enabling the arm pin to be inserted (see FIG. 7).
[0038]
Further, if the bush holder is pushed downward, the cylindrical portion 82 of the clip 8 is finally completely engaged with the groove portion 52a of the arm pin 5 (see FIGS. 4 and 5), and thereafter the arm pin is prevented from coming off in the axial direction. The
[0039]
In short, by connecting the arm pin 5 and the bush holder 7 to each other, the main arm 2 and the adjustment arm 3 can be easily connected with one touch.
[0040]
Further, since the bush holder 7 and the clip 8 are rotatably attached to the adjusting arm 3 by the horizontal pin 9, even if the relative position between the closer body 1 and the bracket 4 is slightly deviated from the design value, the joint device The closer works smoothly without any distortion.
[0041]
Further, since the clip 8 is made of an elastic material, there is an advantage that even if the main arm 2 and the adjustment arm 3 are slightly twisted from the design value, the twist can be absorbed.
[0042]
【The invention's effect】
The joint device between the arms in the door closer according to the present invention described above eliminates the conventionally used set screw and attaches the bush holder attached to the adjustment arm to the arm pin implanted in the main arm as a tool. It is possible to connect by one-touch by pressing without using the, and there is an excellent effect that workability can be improved at the installation site.
[0043]
Moreover, the problem of loosening of the screw can be solved by eliminating the set screw that stops the ends of the main arm and the adjustment arm.
[0044]
Furthermore, the direct connection between the arm pin and the adjusting arm is performed by an elastic clip, so that not only the vertical relative position error between the door closer and the bracket but also the two clothes are slightly twisted with respect to each other. In addition, various effects such as being able to absorb the twist caused by the twisting can be obtained.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing components of a joint device according to an embodiment of the present invention.
FIG. 2 is a side view of a joint device according to an embodiment of the present invention.
FIG. 3 is a plan view thereof.
4 is a cross-sectional view taken along line IV-IV in FIG.
5 is a cross-sectional view taken along line VV in FIG.
6 is a cross-sectional view similar to FIG. 5, showing the joint device in a temporarily placed state.
7 is a cross-sectional view similar to FIG. 5, showing the way to an assembled state.
FIG. 8 is a front view illustrating a joint device between arms in a conventional door closer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Door closer body 2 Main arm 3 Adjust arm 4 Bracket 5 Arm pin 51 Tapered part 52 Cylindrical part 52a Groove part 6 Arm pin bush 61a Notch 7 Bush holder 72a Notch 8 Clip

Claims (1)

An arm pin that is planted at the tip of the main arm and has a tapered portion at the top, and a groove portion is formed in the middle of the cylindrical portion that follows. A hollow cylindrical arm pin bush having a pair of arc-shaped grooves formed symmetrically with respect to the central axis at the position, and rotatably mounted at the tip of the adjustment arm, holding the arm pin bush from the outside, and in the width direction A bifurcated bush holder with a notch formed over its entire length excluding the flat part at the middle position of the arm, and also mounted on the tip of the adjustment arm so as to be rotatable coaxially with the bush holder, and holding the small diameter part of the arm pin from both sides An elastic bifurcated clip that engages in such a way that the movement in the width direction is constrained by the notches of the armpin bushing and bushing holder; Coupling device between the arms in the door closer characterized in that it has.

Images