JP2002013343A - Joint device for link mechanism for door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint device for link mechanism for a door closer with the simple structure and facilitated in fitting of a main arm and an adjust arm to each other, at a low manufacturing cost. SOLUTION: This joint device for the link mechanism for the door closer is provided with the first coupling part 3 provided at an end of a main arm 1, and a second coupling part 4 provided at an end of an adjust arm 2 and coupled on to the first coupling part 3. The first coupling part 3 can be rotated in relation to the end of the main arm 1, and has an elastic sleeve 5. The second coupling part 4 is opened in a direction different from the longitudinal direction of the adjust arm 2, and has an insertion groove 4a for fitting of the sleeve 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coupling device for a link mechanism for a door closer.

[0002]

2. Description of the Related Art Conventionally, in a link mechanism for a door closer, one end of a main arm and one end of an adjustment arm are rotatably connected via a screw.

[0003] However, when a connection structure using screws is employed, the assembly of the main arm and the adjustment arm is relatively complicated, and there is a problem with the loosening of the screws.

A joint device for a link mechanism for a door closer for solving such a problem is disclosed in Japanese Patent Application Laid-Open No. H11-1412.
No. 26 is disclosed. The joint device includes a first connecting portion provided at an end of the main arm, and a second connecting portion provided at an end of the adjusting arm and connected to the first connecting portion. The first connecting portion has an arm pin extending in a direction orthogonal to the length direction of the main arm. This arm pin has a ring-shaped groove opened in a direction orthogonal to the axial direction. On the other hand, the second connecting portion has a bush holder into which the arm pin can be fitted. The bush holder has a notch, and the notch is located corresponding to the groove of the arm pin when the arm pin is fitted to the bush holder. In such a fitting state, an elastic clip is fitted into the notch of the bush holder. The clip prevents the arm pin from coming off the bush holder by engaging with the groove of the arm pin.

[0005] Therefore, in the above-described joint device according to the prior art, since the connection structure using the screw is not adopted, the ease of assembling the main arm and the adjust arm is improved, and the problem regarding the loosening of the screw is solved. You.

[0006]

However, the joint device according to the prior art has a complicated structure, which leads to an increase in manufacturing costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a coupling device for a door closer link mechanism which has a simple structure, further improves the ease of assembling the main arm and the adjusting arm, and has a low manufacturing cost.

[0008]

In order to solve the above-mentioned problems, the present invention according to claim 1 comprises a first connecting portion (3) provided at an end of a main arm (1) and an adjusting arm (3). 2) A coupling device for a door closer link mechanism comprising: a second connecting portion (4) provided at an end of the door connecting portion and connected to the first connecting portion (3).
Has a sleeve (5) that is rotatable with respect to the end of the main arm (1), and has a resilient sleeve (5), and the second connecting portion (4) is connected to the adjusting arm (2). The sleeve (5) has an insertion groove (4a) in which it opens in a direction different from the length direction and in which the sleeve (5) can be fitted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A joint device for a link mechanism for a door closer according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, the door closer link mechanism B comprises a main arm 1 and an adjusting arm 2 so that one end of the main arm 1 and one end of the adjusting arm 2 can be rotated relative to each other. To concatenate,
The joint device of the present invention is applied. The other end of the main arm 1 is fixed to an operating axis Ax of a fluid pressure buffering means in the door closer body A fixed to the door D, and the other end of the adjust arm 2 is fixed to a door frame (not shown). The bracket FB is rotatably connected to the bracket FB.

The joint device comprises a first connecting portion 3 rotatably provided at one end of a main arm 1 and a second connecting portion 4 provided at one end of an adjusting arm 2 so as to be connected thereto. Be composed.

As shown in FIG. 4, an arm pin 1a is fixed to one end of the main arm 1 so as to protrude in a direction perpendicular to its length. The first connecting portion 3 is rotatably attached to the arm pin 1a via a bearing 7. In FIG. 4, reference numeral 1b denotes a bolt for holding the bearing 7 and the first connecting portion 3 in an appropriate mounting state.

As is apparent from FIG. 2, the first connecting portion 3 is fitted to the outer periphery of the bearing 7 and has a C-shaped main body 3a.
And a pair of mounting portions 3b, 3c integrally formed at the ends thereof and facing each other. Mounting part 3
A pipe 8 is arranged between b and 3c, and is fixed to the mounting portions 3b and 3c by rivets 6. The pipe 8 and the rivet 6 are arranged coaxially with each other, and have a central axis extending parallel to a straight line orthogonal to the central axis of the arm pin 1a. The swage width of the rivet 6 varies depending on the length of the pipe 8.

The sleeve 5 is attached to the outside of the pipe 8 described above. The sleeve 5 is formed of a material having elasticity, for example, a synthetic resin. As shown in FIG. 3, the sleeve 5 has a cylindrical sleeve main body 5a and a pair of outward flanges 5b integrally formed at both ends thereof. , 5c
It is composed of As shown in FIG. 2, the flanges 5b and 5c regulate the movement of the adjusting arm 2 in the axial direction of the rivet 6.

The sleeve 5 has a part around its circumference.
It has a slit 5d extending in the length direction. Therefore,
Since the sleeve 5 is formed of an elastic material and has the slit 5d, the sleeve 5 can be expanded and contracted in the radial direction. The sleeve 5 has a maximum outer diameter d2 (see FIG. 5) when no external force is applied thereto.
(See (a)).

The second connecting portion 4 is integrally provided at one end of the adjusting arm 2 as shown in FIG. The second connecting portion 4 has an insertion groove 4a into which the sleeve 5 attached to the outside of the pipe 8 can be fitted. Insertion groove 4
“a” is opened downward in FIG. 4 in a direction different from the length direction of the adjusting arm 2, that is, perpendicular to the length direction.

The insertion groove 4a has an arcuate guide surface, which comes into contact with the outer peripheral surface of the sleeve 5 and regulates its radial expansion. Therefore, the diameter of the arcuate guide surface is slightly smaller than the maximum outer diameter d2 in the expanded state of the sleeve 5 described above. On the other hand, the sleeve 5 attached to the outside of the pipe 8 can be reduced to the minimum outer diameter d1 (see FIG. 5B) by the slit 5d, but the minimum length L1 at the opening of the insertion groove 4a is It is configured to be slightly larger than the minimum outer diameter d1 so that the sleeve 5 thus reduced can pass through.

The sleeve 5 is fitted to the outside of the pipe 8 so as to widen the slit 5d. Of course, the rivet 6 may be arranged between the mounting portions 3b and 3c of the first connecting portion 3 together with the pipe 8 before the caulking process.

Next, a method of using the joint device of the present invention will be described.

To connect the adjusting arm 2 to the main arm 1, the second connecting portion 4 of the adjusting arm 2 is arranged above the first connecting portion 3 of the main arm 1, as shown in FIG. The second connecting part 4 may be pressed against the first connecting part 3.

That is, the state shown in FIG.
When the connecting portion 4 is pressed downward, the opening end of the insertion groove 4a in the second connecting portion 4 is
Contacts the outer peripheral surface of. From this state, the second connecting portion 4 is moved to the first
When further pressed against the connecting portion 1, the sleeve 5 is reduced to the minimum outer diameter d1. As described above, the minimum length L1 at the opening of the insertion groove 4a is slightly larger than the minimum outer diameter d1 so that the sleeve 5 thus reduced can pass through. It is received in the groove 4a. When the sleeve 5 is received in the insertion groove 4a, the sleeve 5 expands outward due to its elasticity and comes into contact with the arc-shaped guide surface of the insertion groove 4a.

As described above, the second connecting portion 4 is connected to the first connecting portion 3
, The sleeve 5 of the first connecting portion is received in the insertion groove 4a of the second connecting portion 4, whereby the adjusting arm 2 can be connected to the main arm 1 very easily. In such a connected state, a slight gap is formed between the sleeve 5 and the pipe 8 as shown in FIG. Therefore, unless the second connecting portion 4 moves away from the sleeve 5 to reduce the size of the sleeve 5, the first connecting portion 3 and the second connecting portion 4
The connection with is not released. Moreover, in order to release the connection between the first connecting portion 3 and the second connecting portion 4, the second connecting portion 4 is moved upward in FIG. 5 in a direction orthogonal to the length direction of the adjusting arm 2. Must be
During normal use of the door closer, since the second connecting portion 4 does not move in such a direction, the second connecting portion 4 moves from the first connecting portion 3 unless an artificial connection releasing operation is performed. It will not come off.

Of course, when removing the adjusting arm 2 from the main arm 1, the second connecting portion 4 may be pulled upward in the direction perpendicular to the length direction of the adjusting arm 2 and in FIG.

[0024]

According to the first aspect of the present invention, the first connecting portion has an elastic sleeve, and the second connecting portion opens in a direction different from the length direction of the adjusting arm. However, since the sleeve has the insertion groove in which the sleeve can be fitted, the connecting structure can be simplified, the ease of assembling the main arm and the adjusting arm can be further improved, and the manufacturing cost can be reduced. Moreover, since the first connecting portion is rotatable with respect to the end of the main arm, the first connecting portion can absorb manufacturing variations and mounting errors of the main arm and the adjusting arm.

[Brief description of the drawings]

FIG. 1 is a front view of a door closer to which a joint device of the present invention is applied.

FIG. 2 is a partial sectional view showing the joint device of the present invention.

FIG. 3 is a perspective view showing a sleeve in the joint device of the present invention.

FIG. 4 is a front view showing a connection state between a first connection portion and a second connection portion in the joint device of the present invention.

FIG. 5 is a diagram showing a connecting process between a first connecting portion and a second connecting portion in the joint device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main arm 2 Adjust arm 3 1st connection part 4 2nd connection part 4a Insertion groove 5 Sleeve

Claims (1)

[Claims] A first connecting portion provided at an end of a main arm; and a first connecting portion provided at an end of an adjusting arm.
A coupling device for a link mechanism for a door closer comprising a second connecting portion connected to a connecting portion, wherein the first connecting portion is rotatable with respect to the end of the main arm, and has elasticity. A door closer having a sleeve, wherein the second connecting portion is opened in a direction different from a length direction of the adjusting arm, and has an insertion groove in which the sleeve can be fitted. Device of the link mechanism for the car.