JP2002061453A - Stop-angle adjusting mechanism for door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stop-angle adjusting mechanism, by which engagement and disengagement with and from a bracket-shaft cam plate are facilitated and a backlash is not generated. SOLUTION: A tapered section is formed at an inserting end section into the mounting hole 7 of the cam plate 4 of an external serration 6 for a bracket shaft 2 while the opening edge section of the mounting hole 7 in the rear of a remote section from a bracket of the cam plate 4 is caulked in a ring shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stop angle adjustment mechanism for a door closer (hereinafter simply referred to as a stop angle adjustment mechanism).
More particularly, the present invention relates to a stop angle adjusting mechanism capable of firmly coupling a bracket pin and a cam plate while easily attaching and detaching an outer serration formed on a bracket pin and an inner serration formed on a cam plate.

[0002]

2. Description of the Related Art A device for stopping a door closer, that is, a device for temporarily stopping a door closer in a closing motion,
For example, when carrying luggage into a room, it is convenient that the door does not have to be held by hand.

Various types of door closing devices have been proposed, but one that has a simple structure and reliable operation is incorporated in a link mechanism of the door closer.

As shown in FIG. 1, this stopping device is mounted on a bracket shaft 2 which is usually fixed to a door frame (not shown) via a bracket 1, and has a recess 3 which engages with a click ball described later. A click body such as a click ball (not shown) that is housed in the cylindrical base A of the fork arm 5 rotatably supported on the cam plate 4 and the bracket shaft 2 and urged in the bracket shaft 2 direction. And

Then, the door closer operates in the closing direction, and the fork arm 5 rotates relatively around the bracket shaft 2 with respect to the cam plate 4 fixed to the bracket shaft 2 and is built in the base A thereof. When the click ball is aligned with the concave portion 3 of the cam plate, the click ball enters the concave portion 3 and stops against the closing force of the door closer.

As shown in FIG. 2, this type of stop device can incorporate a stop angle position adjusting mechanism.

That is, in FIG. 2, reference numeral 6 denotes an outer serration formed in the base line direction of the base of the bracket shaft 2 fixed to the bracket 1, and the outer serration 6 is an opening of the mounting hole 7 of the cam plate 4. It can mesh with the inner serration 8 formed on the edge.

The cam plate 4 formed as described above is used.
Is inserted horizontally into a slit 9 formed at the base end of the fork arm 5, and after the mounting hole 7 is aligned coaxially with the rotation axis of the fork arm, the bracket shaft 2 is connected to the base end of the fork arm 5. The inner and outer serrations 8 and 6 are inserted into the bearing holes 11 to engage at appropriate relative angular positions.

The stop angle adjusting mechanism constructed as described above includes the collars 12 and 12, the support plate 13 and the cover 1.
4 together with a set screw 15.

For this reason, if the set screw 15 is loosened, the respective components can be relatively moved in the vertical direction in FIG. 2, so that the engagement between the inner serration 8 of the cam plate 4 and the outer serration 6 of the bracket shaft is established. Therefore, the stop angle can be adjusted by retightening the set screw 15 after adjusting the relative angular positions.

The applicant of the present invention has previously filed Japanese Patent Application No.
No. 98061-2 proposes a stop angle adjusting mechanism capable of semi-automatically engaging and disengaging the bracket shaft 2 and the cam plate 4 using a jig.

[0012]

The various stop angle adjusting mechanisms described above are of course used for their intended functions, but the conventional ones are designed to fit the outer and inner serrations 6 and 8 smoothly. Therefore, there is a resentment that the engagement and disengagement are not smoothly performed when adjusting the stop angle.

In other words, the cam plate 4 is hard to fit on the bracket shaft 2 and is hard to remove. The above-mentioned proposal of the present applicant is even more so as to engage and disengage via a jig.

If these fittings are loosened in order to facilitate engagement and disengagement of the outer and inner serrations, there is a disadvantage that backlash occurs, which causes abnormal noise and noise when the door closer is operated.

Accordingly, an object of the present invention is to propose a stop angle adjusting mechanism in which the bracket shaft and the cam plate can be easily engaged and disengaged and in which backlash does not occur, thereby solving the above-mentioned disadvantages.

[0016]

In order to achieve the above object, the present invention provides a bracket shaft having one end connected to a bracket and having an outer serration formed on a part of an outer peripheral surface, and a bracket shaft fitted at a base end. A fork arm having a support hole that opens and a slit perpendicular to the support hole, a click body built into the base end of the fork arm and urged in the direction of the center axis of the support hole, A cam plate formed with a recess for engaging with the click body, opening a mounting hole to be fitted with the bracket shaft, and having an inner serration meshing with the outer serration at an opening edge of the mounting hole. A tapered portion is formed at the insertion end of the outer serration into the mounting hole, and an opening edge of the mounting hole on the back surface of the cam plate remote from the bracket. And wherein the crimped ring shape.

[0017]

An embodiment of the present invention will be described below with reference to FIGS. FIG. 3 shows a main part of a stop angle adjusting mechanism according to one embodiment of the present invention, and reference numeral 2 in the figure denotes a bracket shaft.

The upper end of the bracket shaft 2 is a short pillar whose upper end is connected to the bracket 1 (see FIGS. 1 and 2) by welding or caulking.

An outer serration 6 is formed, for example, substantially at the center of the outer peripheral surface of the bracket shaft 2.

A conventional type in which disassembly, angle adjustment, and assembly are repeated using a conventional tool such as a driver shown in FIGS. Although the shape of the bracket shaft 2 is different from that described in the specification and drawings of No. 198061-2 according to the purpose, the difference in shape is not the gist of the present invention, so a more detailed description will be given. Omitted.

This bracket shaft 2 which is normally fixed
A cam plate 4 having an inner serration 8 formed at the opening edge of the mounting hole 7 is inserted in the direction of arrow A and fitted.

When the cam plate 4 is mounted, the cam plate 4 is
When viewed from the side, the lower end of the outer serration 6 in FIG. 3 is the insertion end.

A tapered portion 16 is formed at the insertion end of the outer serration 6, as shown in FIG.

The one-side taper angle of the tapered portion 16, that is, the angle α shown in FIG. 4, is preferably, for example, about 3 degrees (this angle is exaggerated in FIG. 4).

In the illustrated embodiment, the length of the tapered portion 16 in the generatrix direction is about 外側 of the length of the outer serration 6 in the generatrix direction. In actual products, the length of the tapered portion 16 is about 2 mm (abrasion).

Under the above design conditions, when the outer diameter of the outer serrations 6 is 20 mm, the outer diameter of the insertion end of the tapered portion 16 is about 19.8 mm.

When the tapered portion 16 is provided on the outer serration 6 as described above, the fitting with the cam plate 4 is smooth, and the outer serration 6 can be mounted on the through hole, while the tapered portion 16 between the tapered portion 16 and the mounting hole 7 of the cam plate after mounting. Backlash (play) may occur, and unpleasant noise may occur.

In order to prevent this, as shown in FIG.
The opening edge of the mounting hole 7 on the rear surface (the lower surface in FIGS. 3 and 5) of the cam plate 4 farther from the bracket 1 (see FIG. 2) is swaged in a ring shape, and the opening edge near the cam plate rear surface. An annular overhang 17 is formed.

The overhang portion 17 is provided with the inner serration 8.
Each of the numerous ridges constituting the outer serrations 6
It goes without saying that it engages with the tapered portion in such a manner that it enters the valley between the ridges at the lower end of the tapered portion 16.

The crimping for forming the overhanging portion 17 is performed, for example, by mounting a pipe-shaped punch having an inner diameter slightly larger than the circumscribed circle of the inner serration 8 and a thickness of about 2 mm from the back side of the cam plate 4 to the mounting hole. Hits coaxially with 7.

At this time, the depth of the ring-shaped indentation 18 is
For example, 0.2 to 0.3 mm is preferable.

The product at the time of caulking is designed so that the amount of projection of the mounting hole 7 of the overhanging portion 17 in the central axis direction becomes excessive and the overhanging portion 17 does not bite with the tapered portion 16 of the outer serration at the time of mounting. A cam plate is attached to a jig having an outer serration 6 formed with a tapered portion 16 having the same dimensions as that of the cam plate (not shown), and then it is possible to caulk with a punch.

In this case, the amount of protrusion of the projecting portion 17 from the inside is suppressed by the jig, and does not become excessive.

The present invention having the above-described structure is shown in FIGS.
It is needless to say that the present invention can be applied not only to the conventional stop angle adjusting mechanism shown in FIG. 1 but also to the one described in the specification and drawings of Japanese Patent Application No. 10-198061-2 based on the earlier proposal of the present applicant. Absent.

[0035]

As is apparent from the above description, according to the present invention, a tapered tapered portion is formed at the insertion end of the outer serration of the bracket shaft into the mounting hole, and the back surface of the cam plate remote from the bracket. Since the opening edge of the mounting hole is caulked in a ring shape, not only is the cam plate engaged and disengaged from the bracket shaft extremely smooth, but also there is no backlash or abnormal noise when the two are connected.

Also, various effects are exhibited, such as that the structure of the invention is extremely simple.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a link mechanism of a conventional door closer having a stop device.

FIG. 2 is an external perspective view showing components of the stop angle adjusting mechanism in a developed state.

FIG. 3 is a diagrammatic partial cross-sectional front view of a bracket shaft and a cam plate showing main parts of the present invention.

FIG. 4 is an enlarged view of a portion B in FIG. 3;

FIG. 5 is an enlarged view of a portion C in FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bracket 2 bracket shaft 3 concave portion 4 cam plate 5 fork arm 6 outer serration 7 mounting hole 8 inner serration 9 slit 10 upper collar 11 support hole 16 taper portion 17 overhanging portion 18 indentation

Claims (1)

[Claims] 1. A bracket shaft having one end connected to a bracket and having an outer serration formed on a part of an outer peripheral surface, and a support hole for fitting the bracket shaft at a base end thereof is opened.
A fork arm having a slit perpendicular to the support hole, a click body built into the base end of the fork arm and urged in the direction of the center axis of the support hole, and a concave portion on the outer periphery engaging with the click body And a cam plate formed with an inner serration capable of meshing with and engaging with the outer serration at an opening edge of the mounting hole. A stop angle of a door closer characterized by forming a tapered portion at an insertion end into a mounting hole and caulking an opening edge of the mounting hole on a back surface remote from a bracket of a cam plate in a ring shape. Adjustment mechanism.