JP2007138397A - Door closer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door closer preventing a scatter of abrasion powder from a rotating part between door closer components. <P>SOLUTION: The door closer comprises a rotating shaft for supporting a pair of door closer components relatively rotated in response to opening/closing of a door, rotatably to each other; sliding members which slide along the rotating shaft; and covers formed of thin plates into ring shape covering the open surface side of the sliding members and smoothly finished at least on the contact surfaces with the sliding members. The covers are provided on the open surface side of the sliding members, and abrasion powder produced from a sliding part between the rotating shaft and each sliding member and from a sliding part between the sliding member and the cover is retained on the inner surface side of the cover and prevented from being scattered to the outside. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a door closer used for a door of a clean room.

  When the door closer is provided on the door of the clean room, there is a problem that the wear powder impairs cleanliness of the clean room when the sliding powder between the door closer parts, particularly the rotating powder from the rotating portion is scattered. For this reason, it is necessary to provide the door of a clean room with the door closer which suppressed scattering of abrasion powder.

  Conventionally, door closers that suppress the scattering of wear powder from rotating parts between door closer parts have been developed. For example, a magnetic fluid seal device that shuts off the sliding surface from the outside at the rotating parts between door closer parts has been incorporated. A door closer is known (for example, see Patent Document 1).

The magnetic fluid seal device used in the conventional door closer described above includes a ring-shaped magnet sandwiched between two ring-shaped ferrite plates, and further fills the inner peripheral portion of the ferrite plate with magnetic fluid, thereby In this configuration, the gap between the penetrating door closer part and the ferrite plate is filled, so that the abrasion powder generated from the rotating portion is blocked and is not scattered outside.
Utility Model Registration No. 2561486

  However, in the above-described conventional door closer, the magnetic fluid sealing device has a magnet and a ferrite plate that are tripled, and the thickness of the magnetic fluid sealing device itself is increased. For this reason, the use of a magnetic fluid sealing device increases the size of the rotating part between the door closer parts. In particular, in the portion where the rotating portion between the door closer parts is opened up and down, for example, the connecting portion of the arm and the link, the magnetic fluid seal device needs to be provided up and down, so the size further increases. Therefore, the conventional door closer has a problem in that the outer dimension of the door closer itself increases as a result of an increase in the size of the rotating portion between the door closer parts. In addition, the structure of the magnetic fluid seal device is complicated, and there is a problem that assembly and maintenance are required.

  Therefore, the present invention can prevent the scattering of wear powder from the rotating parts between the door closer parts, suppress the increase in the dimension of the rotating parts between the door closer parts, simplify the structure of the rotating parts, and require labor for assembly and maintenance. The purpose is to provide a door closer.

In order to achieve the above object, in the invention according to claim 1, a rotating shaft that rotatably supports a pair of door closer parts that rotate relative to each other according to opening and closing of the door,
A sliding member that slides on the rotating shaft;
A cover that is formed of a thin plate and has a ring shape that covers the open surface side of the sliding member, and at least a contact surface with the sliding member is smoothly finished;
The door closer was equipped with.

  In the invention according to claim 2, in the invention according to claim 1, the rotating shaft is made of a soft metal material, and the sliding member is made of a sliding material for a soft mating member.

(Function)
Therefore, in the first aspect of the invention, since the cover is formed of a thin plate and covers the open surface side of the sliding member, wear powder is generated from the sliding portion between the rotating shaft and the sliding member. Even so, the wear powder is kept on the inner surface side of the cover to prevent scattering to the outside. Further, at least the contact surface of the cover with the sliding member is finished smoothly, so that the wear powder coming out from the sliding portion between the sliding member and the cover is small. Since the cover has a shape that covers the open surface side of the sliding member, even if abrasion powder is generated, the cover is held on the inner surface side of the cover to prevent scattering to the outside.

  In the invention according to claim 2, the sliding member is made of a sliding material for a soft mating material based on a fluororesin, and it is difficult to wear the rotating shaft made of a soft metal material. The occurrence of is slight. Even if abrasion powder is generated, it stays on the inner surface side of the cover, and scattering to the outside is prevented.

  According to the first aspect of the present invention, since the cover is provided on the open surface side of the sliding member, the sliding portion between the rotating shaft and the sliding member and the sliding portion between the sliding member and the cover. All of the wear powder generated from the air stays on the inner surface side of the cover and can be prevented from scattering to the outside.

  Moreover, since the cover is formed of a thin plate and has a ring shape covering the open surface side of the sliding member, and the cover itself has a small thickness, an increase in the size of the rotating portion between the door closer parts can be suppressed. Furthermore, since the cover has a simple structure, no effort is required for assembly and maintenance.

  According to the second aspect of the present invention, the generation of wear powder generated from the sliding portion between the sliding member and the rotary shaft can be kept low, and even if the wear powder is generated, it remains on the inner surface side of the cover. , Scattering to the outside can be prevented.

  Embodiments of the present invention will be described with reference to the drawings.

  A first embodiment of the present invention will be described with reference to FIGS. The door closer according to the first embodiment has a connecting portion between the bracket 53 and the link 51 as shown in FIG. 1A, and the main arm 52 and the link 51 as shown in FIG. And a connecting part. First, a connecting portion between the bracket 53 and the link 51 will be described with reference to FIG. 1A. The connecting portion includes a joint pin 1 as a rotating shaft, bushes 3a and 3b as sliding members, covers 4a and 4b, and bolts. 13.

  The joint pin 1 as a rotating shaft is a member that rotatably supports a bracket 53 and a link 51 that rotate relative to each other according to opening and closing of a door (not shown). The joint pin 1 is formed of SUS304 as a soft metal material. A caulking portion 11 for caulking to the bracket 53 is formed at the upper end portion of the joint pin 1 in the figure. A female screw portion 12 for screwing with the bolt 13 is formed at the lower end portion in the figure.

  The bushes 3 a and 3 b as the sliding members are members provided as bearings for the joint pin 1. As shown in FIG. 2, the bushes 3 a and 3 b have a bush main body 31 and a flange portion 32. The bush main body 31 is a portion that fits into the connection hole 55 of the link 51. The flange portion 32 is a portion protruding from the peripheral portion of the upper surface portion or the lower surface portion of the bush main body 31. The surface on which the flange portion 32 is formed becomes an open surface. A shaft hole 33 on which the joint pin 1 is pivotally supported is provided at the center of the bushes 3a and 3b. The material of the bushes 3a and 3b is a sliding material for soft mating material. As the sliding material for the soft counterpart material, for example, BEAREE FL3030 (NTN Corporation, registered trademark), which is a synthetic resin material based on ethylene tetrafluoride, can be used.

  The covers 4a and 4b are members that cover the open surfaces of the bushes 3a and 3b. As shown in FIG. 2, the covers 4a and 4b are formed of thin plates and have a ring shape covering the open surface side of the bushes 3a and 3b. SUS304 is used as the material of the covers 4a and 4b. A through hole 41 through which the joint pin 1 passes is provided at the center of the covers 4a and 4b. As shown in FIG. 1, the upper surface of the cover 4 a slides in contact with the bush 3 a, and the lower surface of the cover 4 a contacts a washer 14 fitted on the bolt 13. In order to suppress the generation of abrasion powder from the sliding portion, the surface of the cover 4a is finished smoothly both on the upper surface and the lower surface in the drawing. In addition, the upper surface of the cover 4b shown in the drawing does not slide in close contact with the bracket 53 as described later, and the lower surface slides relative to the bush 3b. In order to suppress the generation of wear powder from the sliding portion, the lower surface of the cover 4b is finished with a smooth bottom surface. The surface roughness of the surfaces of the covers 4a and 4b that are finished smoothly is the centerline average roughness 0.40a, but is not limited to this.

  Next, the assembly of the connecting portion between the bracket 53 and the link 51 will be described (see FIG. 1). First, the joint pin 1 in which the crimping portion 11 is not crimped is passed through the hole of the bracket 53 in a state where the joint pin 1 is passed through the through hole 41 of the cover 4b, and the crimping portion 11 at the upper end portion of the joint pin 1 is crimped. 1 is fixed. At this time, the cover 4b is brought into close contact with the bracket 53 so as not to slide. On the other hand, two bushes 3a and 3b are attached to the connection hole 55 of the link 51 from both sides, and the flange portion 32 of the bushes 3a and 3b is exposed around the connection hole 55 of the link 51. The joint pin 1 fixed to the bracket 53 is passed through the shaft hole 33 of the bushes 3a and 3b attached to the bracket 3. A cover 4a is attached to the lower surface side of the bush 3a attached to the lower surface side of the link 51 to cover the open surfaces of the bushes 3a and 3b. Then, after passing the washer 14 through the bolt 13, the bolt 13 is screwed into the female thread portion 12 of the joint pin 1, and the bracket 53 and the link 51 are rotatably connected.

  The connecting portion between the bracket 53 and the link 51 has the following effects.

  (A) Since the covers 4a and 4b are provided on the upper and lower surfaces of the bushes 3a and 3b as the sliding members, the sliding portions of the joint pin 1 and the bushes 3a and 3b and the bushes are provided. The abrasion powder generated from the sliding portions of 3a and 3b and the covers 4a and 4b stays on the inner surface side of the covers 4a and 4b, that is, in the shaft holes 33 of the bushes 3a and 3b, and can prevent scattering to the outside. it can.

  (A) The covers 4a and 4b have a smooth contact surface with the bushes 3a and 3b, and a little amount of wear powder comes out of the sliding portion between the bushes 3a and 3b and the covers 4a and 4b. Further, the bushes 3a and 3b are made of a sliding material for a soft mating material using a fluororesin as a base material, and since it is difficult to wear the joint pin 1 formed of SUS304 as a soft metal material, wear powder is generated. Is slight. Even if abrasion powder is generated, it stays in the inner surfaces of the covers 4a and 4b, that is, in the shaft holes 33 of the bushes 3a and 3b, and can be prevented from scattering to the outside.

  (C) The covers 4a and 4b are formed of thin plates and have a ring shape covering the open surfaces of the bushes 3a and 3b. Since the covers 4a and 4b themselves have a small thickness, the bracket 53 and the link 51 An increase in dimension of the connecting portion can be suppressed.

  (D) Since the structure for preventing the scattering of wear powder from the connecting portion between the bracket 53 and the link 51 is simple, no effort is required for assembly and maintenance.

  Next, a connecting portion between the main arm 52 and the link 51 will be described with reference to FIG. This connecting portion has a joint pin 1 as a rotating shaft, bushes 3a and 3b as sliding members, covers 4a and 4b, and bolts 13. The difference between the bracket 53 and the link 51 shown in FIG. 1A is that the joint pin 1 is attached to the main arm 52. Since other structures are the same as those in the first embodiment, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  The connecting portion between the main arm 52 and the link 51 has substantially the same effect as the connecting portion between the main arm 52 and the link 51.

  A second embodiment of the present invention will be described with reference to FIG. The door closer according to the second embodiment includes a connecting portion between the door closer body 5 and the main arm 52. The door closer body 5 and the main arm 52 are connected to an output shaft 2 as a rotation shaft. The portion that supports the output shaft 2 includes a bush 3a, a cover 4a, a lid 6 as a sliding member, and an O-ring 7.

  The output shaft 2 as a rotating shaft is a member that rotatably supports the door closer body 5 and the main arm 52 that rotate relative to each other according to opening and closing of a door (not shown). The output shaft 2 is rotatably supported by the door closer body 5, and the lower portion in the figure is connected to a mechanism that exerts a door closing force (not shown).

  The bush 3a is a member provided as a bearing for the output shaft 2, and is made of a sintered alloy. An O-ring 7 is provided above the bush 3a. The O-ring 7 prevents the lubricating oil between the bush 3a and the output shaft 2 from flowing out. Even if wear powder is generated between the output shaft 2 and the bush 3a, the wear powder is taken into the lubricating oil and prevented from flowing out by the O-ring 7, so that it is not scattered outside.

  A lid 6 as a sliding member is attached to the door closer body 5. The lid is a member that supports the bush 3 a and the O-ring 7. A circular groove 54 having a constant width is secured between the periphery of the lid 6 and the door closer body 5. A shaft hole 61 in which the output shaft 2 is pivotally supported is provided at the center of the lid body 6.

  The cover 4 a is a member that covers the open surface side of the lid 6. The cover 4 a is formed of a thin plate and has a ring shape that covers the open surface side of the lid 6. A flange 42 is erected downward at the peripheral edge of the cover 4 a and fits into a groove 54 secured between the door closer body 5. A through hole 41 through which the output shaft 2 passes is provided at the center of the cover 4a. Since the cover 4a rotates together with the output shaft 2, there is no sliding portion between the cover 4a and the output shaft 2, but the surface on the lower surface side of the cover 4a in contact with the lid 6 slides. In order to suppress generation of abrasion powder from the sliding portion, the surface on the lower surface side of the cover 4a in the figure is finished smoothly.

  The door closer according to the second embodiment has the following effects.

  (E) Since the cover 4a is provided on the upper surface in the figure, which is the open surface side of the lid 6 as a sliding member, the rotating portion of the output shaft 2 and the lid 6 and the sliding of the lid 6 and the cover 4a Any wear powder generated from the portion stays on the inner surface side of the cover 4a, that is, in the shaft hole 61 of the lid body 6, and can be prevented from scattering to the outside.

  (F) The cover 4a has a smooth contact surface with the lid body 6, and little wear powder comes out of the sliding portion between the lid body 6 and the cover 4a. Even if the abrasion powder is generated, it stays on the inner surface side of the cover 4a, that is, in the shaft hole 61 of the lid body 6, and can be prevented from scattering to the outside.

  (G) The cover 4a is formed of a thin plate and has a ring shape covering the open surface side of the lid 6 and the cover 4a itself has a small thickness. Therefore, the connection portion between the door closer body 5 and the main arm 52 is An increase in dimensions can be suppressed.

  (H) Since the structure for preventing the scattering of abrasion powder from the connecting portion of the door closer body 5 and the main arm 52 is simple, no effort is required for assembly and maintenance.

FIG. 3 is a partial cross-sectional view of the door closer according to the first embodiment, where (a) is a connecting portion between the bracket 53 and the link 51, and (b) is a connecting portion between the main arm 52 and the link 51. It is an expansion perspective view of bush 3a, 3b and cover 4a, 4b. 6 is a cross-sectional view of a connecting portion between a door closer body 5 and a main arm 52 of a door closer according to Embodiment 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint pin as a rotating shaft 11 Caulking portion 12 Female screw portion 13 Bolt 14 Washer 2 Output shaft 3a, 3b as a rotating shaft Bush 31 as a sliding member 32 Flange portion 33 Shaft hole 4a, 4b Cover 41 Through hole 42 collar 5 door closer body 51 link 52 main arm 53 bracket 54 circular groove 55 connecting hole 6 lid 61 as sliding member shaft hole 7 O-ring

Claims (2)

A rotating shaft that rotatably supports a pair of door closer parts that rotate relative to each other according to the opening and closing of the door;
A sliding member that slides on the rotating shaft;
A cover that is formed of a thin plate and has a ring shape that covers the open surface side of the sliding member, and at least a contact surface with the sliding member is smoothly finished;
A door closer characterized by comprising. The rotating shaft is made of soft metal material,
The door closer according to claim 1, wherein the sliding member is formed of a sliding material for a soft mating member.

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