JP2561908Y2 - Door closer - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] A magnetic fluid seal is provided on the output shaft.
The present invention relates to a door closer capable of suppressing wear powder generated by sliding rotation between an O-ring or a metal bearing and an output shaft into a room.

[0002]

2. Description of the Related Art A conventional door closer device is shown in FIG.
Door closer 20 attached to door D as shown in FIG.
Arm A fixed to the output shaft 21 is connected to a bracket B attached to a door frame via a link L. As shown in FIG. 2 (b), the door closer 20 is configured such that a bearing case 23 is screwed into an output shaft penetrating portion of a door closer main body 22, and the output shaft is inserted through a metal bearing 24 fitted in the bearing case 23. Support, O-ring 25 is metal bearing 2
4 and the bearing case 23, and the output shaft 21
The arm A is attached to the arm.

[0003]

In the conventional door closer, the abrasion powder generated by the sliding rotation of the O-ring or the metal bearing and the output shaft is discharged to the outside of the door closer, that is, indoors, so that dust in a clean room or the like is removed. It was inconvenient to use it for the door of the room you hate.

The present invention has been devised in view of the above-mentioned point. A magnetic fluid sealing device is provided on an output shaft, and wear powder generated by sliding rotation between an O-ring or a metal bearing and an output shaft is introduced into a room. It is an object of the present invention to provide a door closer that can suppress discharge.

[0005]

According to the present invention, as a means for solving the above-mentioned problems, there is provided an output shaft 11 to which a rotational force is applied by a compression coil spring or the like, and the output shaft 11 is provided inside a door closer body 12. In the door closer device, which is supported by being inserted through the metal bearing 13, a magnetic fluid sealing device 14 for blocking a sliding surface between the metal bearing 13 and the output shaft 11 from the outside is provided in the door closer body 12. A door closer is provided.

[0006]

Since the magnetic fluid seal device 14 blocks the sliding surface between the O-ring 15 and the metal bearing 13 and the output shaft 11 from the outside, it is generated by the sliding rotation of the O-ring 15 and the metal bearing 13 and the output shaft 11. The abrasion powder M can be contained inside.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a door closer according to the present invention will be described with reference to FIG. This door closer has an output shaft 11 to which a rotational force is applied by a compression coil spring or the like, and a bearing case 16 is screwed into a door closer body 12, and the output shaft 11 is inserted through a metal bearing 13 internally fixed to the bearing case 16. And it will be pivoted. And metal bearing 13
Sealing device 1 that blocks the sliding surface between the shaft and output shaft 11 from the outside
4, the O-ring 15 is replaced with the bearing case 16 as in the prior art.
A magnetic fluid sealing device 14 is provided outside the O-ring 15 as well as inside. An arm A is fastened to the tip of the output shaft 11 with a screw 18.

The magnetic fluid sealing device 14 includes a ring-shaped magnet 14a sandwiched between two ring-shaped yokes (for example, a ferrite plate) 14b.
1 is fitted into the seal receiving holes at both ends of the bearing case 16 so as to be fitted to the journal portions at both ends, and the inner circumference of the yoke 14b is filled with a magnetic fluid 14c to fill the gap between the yoke 14b and the output shaft 11. Output shaft 11 and metal bearing 1
The abrasion powder M generated from the sliding surface with No. 3 is shut off so as not to be discharged indoors. In the bearing case 16, a dust chamber 26 is formed inside the magnetic fluid seal device 14 for retaining abrasion powder M generated from the sliding surface between the output shaft 11 and the metal bearing 13. Magnetic fluid 1 by pressure
4c is prevented from being pushed out. Since the lower end of the output shaft 11 can be hermetically sealed by covering the cap 17, the lower magnetic fluid sealing device 14 can be omitted.

[0009]

As described above, according to the door closer of the present invention, since the magnetic fluid sealing device is provided at the outermost portion of the portion of the door closer that supports the output shaft,
Abrasion powder M generated by sliding rotation between the O-ring or the metal bearing and the output shaft can be suppressed from being released to the outside (= room) of the door closer.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a door closer according to an embodiment of the present invention.

FIG. 2A is a schematic plan view of a door closer device,
(B) is a vertical sectional view of a main part of a conventional door closer.

[Explanation of symbols]

 11 ... output shaft, 12 ... door closer body, 13 ... metal bearing, 14 ... magnetic fluid sealing device,

Claims (1)

(57) [Scope of request for utility model registration] 1. A door closer device having an output shaft to which a rotational force is applied by a compression coil spring or the like, and wherein said output shaft is inserted into and supported by a metal bearing housed in a door closer main body. A door closer characterized in that a magnetic fluid sealing device for blocking a sliding surface with an output shaft from the outside is provided in the door closer body.