JP2002089120A - Dust-free hinge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a hinge, which is used for a clean room and does not generate dust. SOLUTION: In the dust-free hinge used for opening and closing doors in construction, a magnet bearing constituted by holding a permanent magnet between upper-lower both yokes manufactured of a ferromagnetic body is fitted to all shaft cylinder joining sections in the hinge respectively, and a non- magnetic metallic axial center is assembled by penetrating to a shaft cylinder and the magnet bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a hinge for a door in a building, and more particularly to preventing dust from scattering due to wear of the hinge when opening and closing the door.

Therefore, if it is used for doors and windows of dust-free rooms in the precision industry and the electronics industry, it has the effect of reducing dust in the room. This has the effect of preventing the fine powder that scatters from scattering and contaminating the wall surface near the hinge.

[0003]

2. Description of the Related Art Conventional hinges include a ball bearing (ball bearing) at a joint of a barrel and a washer or sleeve made of a plastic material (eg, nylon or delrin) in order to reduce wear of the hinge due to use. Usually, a bushing was inserted, and no consideration was given to fine dust that would be scattered due to wear of the hinge.

[0004] However, with the development of the precision industry and the electronics industry, "hinges that do not generate dust used for doors of advanced dust-free rooms" have been required, and the following hinges have appeared.

Japanese Utility Model Application Sho 63-24532, “Hinges for Clean Room” (Japanese Utility Model Application Laid-Open No. 1-129464)

Japanese Patent Application No. 10-207256 (Patent No. 2958309) “Metal Dust Prevention Hinge”

[0007]

In the above arrangement, a cover slightly larger than the hinge is attached to the hinge barrel side (opening side of the door) of the hinge attached to the door, and the supplementary dust is collected inside the cover. In order to clean and remove dust, the cover could be removed. This configuration has the drawback that not only the removal of the flying dust is not perfect, but also the appearance is poor and the management is troublesome.

In the above structure, "there is no contact between metals when the door is opened and closed, and no metal dust is generated while maintaining sufficient strength as a hinge."
It has said.

However, with the hinge having this configuration, "metal dust" is not generated, but as the door is opened and closed, the resin bush, the flange, and the washer slide while being in pressure contact with each other. The resin that makes up the contact portion of the cylinder also wears out and becomes scattered as dust. Resin wear can be caused by the "Showa 45" published by Osaka Prefectural Industrial Promotion Hall Higashiosaka branch office.
Product Test Report, Hinges with Giboshi (Repeated Opening and Closing Test)
・ March 1976 ”is also clear.

That is, the above structure has a disadvantage that metal dust is not generated but resin dust is generated, and it is insufficient as a hinge for obtaining a dust-free environment.

[0008]

The following measures have been taken in order to compensate for the above-mentioned drawbacks of the conventional hinge and to eliminate the scattering of dust.

(A) A magnet bearing having a permanent magnet sandwiched between the upper and lower washers was fitted and mounted on all the joints of the hinge barrel. The magnet bearings are attached to all the joints of the barrels.When hinges are installed in the building openings, the load joints change up and down depending on whether the hinges are installed so that the door is pushed open or pulled open. Therefore, it is for responding to the change of the load joint.

(B) A non-magnetic metal shaft core was used as the shaft core. Since the shaft core passes through the center of the magnet bearing holding the permanent magnet, if a magnetic metal (for example, a normal steel wire) is used as the shaft core, the normal steel wire is a ferromagnetic material, so that the magnet NS The poles are shorted by this ordinary steel wire, and the outward magnetic field lines are extremely reduced. Therefore, in order to avoid this, a non-magnetic metal shaft (for example, 18-
8 stainless steel wire or copper wire).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, one embodiment of the present invention will be described. (1) is a door, (2) is a pillar, and (3) is a hinge.

The magnet bearing (4) has a ring-shaped disk-shaped permanent magnet (7) having an insertion hole (6) in the center of which a shaft core (5) is to be inserted, and upper and lower surfaces of the permanent magnet (7). And a ferromagnetic yoke (8) of the same size as the permanent magnet (7), which is magnetically attracted and held by the magnet. The thickness of the ferromagnetic yoke (8) is set to a value that does not cause magnetic saturation because the yoke (8) is for effectively exerting the magnetic force of the permanent magnet (7). That is, the thickness is 1.0 to 2.0
A millimeter is appropriate.

The permanent magnet (7) is magnetized in the vertical direction, that is, in the length direction of the axis (5). Accordingly, as shown in FIG. 1, the magnetic force lines swelling outward between the upper and lower yokes (8) are provided around the magnetic bearing (4) of this type with the upper and lower surfaces sandwiched by the yokes (8). (9) runs, and an almost donut-shaped magnetic field (1) is formed around the outer periphery of the magnet bearing (4).
0) is possible.

The magnetic field (10) is, of course, invisible to the naked eye, but its presence can be confirmed using a Gauss meter, a magnetic fluid, a magnetic needle or the like.

(11) is the left blade of the hinge, (12) is the right blade of the hinge, (13) is the upper barrel, (14) is the lower barrel, (1)
5) is a middle barrel, (16) is a right star, (17) is a barrel joint, and (18) is a conventional flanged bushing made of a plastic material.

It is desirable to use a solid permanent magnet as strong as possible for the permanent magnet (7), but a bonded magnet mixed with strong magnetic powder may be used.

[0017]

The dust-free hinge of the present invention has the following effects since it is constructed as shown in the drawings and the above description.

(A) The magnet bearing (4) is formed because the upper and lower sides of the permanent magnet (7) are sandwiched between ferromagnetic yokes (8) and the permanent magnet (7) is vertically magnetized. The generated magnetic field (10) can effectively retain the hinged fine dust. Therefore, the fine dust generated by opening and closing the door is not attracted to the permanent magnet (7) and scattered outside the magnetic field (10).

Even when a plastic coating is applied to the shaft core or the like, the plastic dust finely divided by friction always bears positive or negative static electricity. It is attracted to and attracted to the south pole and does not scatter outside the magnetic field (10).

(B) The upper and lower end faces of the permanent magnet (7)
Since the magnet bearing (4) is covered with the ferromagnetic yoke (8) (for example, steel), it has sufficient strength as a load bearing when the door is opened and closed.

(C) Since a non-magnetic metal (for example, 18-8 stainless steel) is used for the shaft core (5), the NS magnetic pole on the inner surface of the circular hole of the permanent magnet (7) is short-circuited (short-circuited). Therefore, the performance of the magnetic force of the permanent magnet (7) is not hindered.

(D) The dust-free hinge to which the magnet bearing (4) is attached has no difference in manufacturing, mounting, use, and strength from the conventional hinge with a bearing, so that there is no sense of incongruity in all. (E) To clean and remove the magnetically held abrasion dust,
By lightly wiping the barrel with a clean cloth squeezed tightly with water, fine abrasion dust can be easily removed. Note that stubborn dirt may be removed by adhesion using a cellophane tape (trade name).

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic bearing used for a hinge according to the present invention, showing an outline of a magnetic field thereof;

FIG. 2 is a front view of the hinge of the present invention,

FIG. 3 is an enlarged view of a magnetic bearing part, also partially shown in section,

FIG. 4 is a perspective view of a conventional flanged bushing, partly shown in section.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Door 2 ... Column 3 ... Hinge 4 ... Magnet bearing 5 ... Shaft core 6 ... Insertion Hole 7 Permanent magnet 8 Ferromagnetic yoke 9 Magnetic field lines 10 Magnetic field 11 Left hinge left hinge 12 ······ Right blade 13 ·························································································· 17: Same as the cylindrical joint 18: Conventional bushing with plastic sleeve

Claims (1)

[Claims] 1. A hinge used for opening and closing a door in a building, wherein a permanent magnet (7) is sandwiched between upper and lower yokes (8) (8) made of a ferromagnetic material. The magnet bearing (4) thus fitted is fitted into all the barrel joints (17) of the hinge (3), and the non-magnetic metal shaft core (5) is fitted to the barrel (13) (14) (15). ) And a magnetic bearing (4).