JPH11350821A - Magnetic door stop - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure an inexpensive supply without disturbing passing of a parson by fixedly mounting a permanent magnetic piece magnetized in the depth direction as well as a magnetic metal yoke in an inner cavity of a lower surface of attraction metal fitting attached to a door, and providing a locking metal fitting to a floor surface in a flash state therewith. SOLUTION: An inner cavity is provided at a lower surface of a nonmagnetic attraction type metal fitting 3 attached to a door 1. In the cavity a yoke 7 and a permanent magnet 5 are built fixedly and a gap therebetween is filled with nonmagnetic material. As the permanent magnetic that is magnetized in the depth direction of the inner cavity is used. The yoke 7 is made of magnetic material and has a thickness so that the magnetic force of the magnet 5 may not saturated. An abutting part 10 is formed by slightly depressing a lower edge 9 of the fitting 3. A disc shaped locking metal fitting 4 is embedded in a floor 2, a locking plate journalled to a rotation shaft 2 is set flush with the surface of floor 2. When the fitting 3 comes close to a position above the fitting 4 after the door 1 is opened, the locking plate 11 is attracted to magnet 5 by the magnetic force and made to slide to the abutting part 10 and stopped thereby. By pulling the door 1 locked, the attracting magnet is removed from the plate 11, and accordingly the door 1 can be closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a convenient door stop which uses a permanent magnet to effectively hold an opened door in its position.

[0002]

2. Description of the Related Art A conventional door stop using a permanent magnet has a permanent magnet fixed to the tip of a columnar support fixed to the floor or a baseboard, and attached to the door at a position where the door is opened. An iron piece adsorbed to the permanent magnet to fix and hold the door in an open position;

[0003] The upright cover of the door stop fitting, which is installed flush with the floor, rises by magnetic force and engages with the engaging groove fixed to the lower frame of the door, thereby engaging the door. (See Japanese Utility Model Laid-Open No. 3-31679).

[0004]

In the first example, there is a drawback that a columnar support fixed to a door or a skirting board obstructs traffic, and in the second example, a permanent magnet with a built-in permanent magnet is used. The special shape not only increases the manufacturing cost, but also
Inability to fully demonstrate the magnetic force of the built-in permanent magnet,
There was a disadvantage.

[0005]

The following measures have been taken in order to eliminate the above-mentioned drawbacks and to provide an inexpensive magnet-type door stop which has a reliable operation and effect. A magnetic metal yoke with a thickness that does not saturate the line of magnetic force of the permanent magnet used, and a permanent magnet of the most common shape, magnetized in the depth direction of the lumen, are arranged in the cavity on the lower surface of the suction fitting in this order. By mounting and fixing the magnet on the, the magnetic force of the used permanent magnet can be exhibited most effectively.

Further, if necessary, the magnetic metal yoke to be used is projected to the side of the magnet surface, so that it is possible to extend the reach of the magnetic field lines in the projection direction, albeit slightly. did.

[0007]

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 floor, (3) is a suction fitting,
(4) is a latch. The attraction metal fitting (3) is made of a non-magnetic material (for example, aluminum, brass, plastic, etc.), and has an inner cavity (6) for accommodating a permanent magnet (5) and the like at the lower surface thereof facing downward.

[0008] A yoke (7) and a permanent magnet (5) are fixed inside the lumen (6) in this order, and if there is a gap in the lumen (6), the gap is not fixed. It is filled with a magnetic filler (8) (eg, aluminum, plastic, etc.).

The permanent magnet (5) may have any shape such as a cylindrical shape, a disk shape, and a box shape.
Is magnetized in the depth direction.

The yoke (7) is made of a magnetic material (eg, mild steel), and its thickness is determined so that the magnetic field lines of the permanent magnet (5) to be used do not saturate. Called York. The yoke (7) has a lumen (6)
Is fixed to the opposite side of the opening, that is, the bottom of the lumen (6), and is in close contact with the surface of the permanent magnet (5) provided therein.

The yoke (7) and the permanent magnet (5) are accommodated in the lumen (6) of the suction fitting (3), and if there is still a gap in the lumen (6), the gap is removed. Preferably, it is filled with a non-magnetic filling (8) to keep the opening of the lumen (6) flat.

The lower edge (9) of the base of the suction fitting (3).
Are slightly recessed to form an abutment portion (10).

Next, a locking metal fitting (4) is a thin dish-shaped metal fitting which is buried flush with the floor (2), and a magnetic metal locking plate (11) is provided at the center of the upper surface thereof. And one end of the locking plate (11) is pivotally mounted on a rotating shaft (12). Normally, the locking plate (11) descends by its own weight, and its tip Is supported by the receiving metal (13), and the upper surface of the locking metal fitting (4) is always kept flush.

When the door (1) is opened and the suction fitting (3) approaches the locking fitting (4), the locking plate (11) is lifted by the magnetic force of the permanent magnet (5), and Stop plate (11)
Is attracted to the permanent magnet (5) by the permanent magnet (5).
Contact When the door (1) is further opened, the locking plate (1) is opened.
1) Permanent magnet (5) while being attracted to permanent magnet (5)
, The tip of which abuts against the abutting portion (10) of the suction fitting (3) and stops. Thus, the door (1) does not open any more and the door (1) is locked in that position. At this time, in order for the permanent magnet (5) to attract and hold the locking plate (11) most strongly, the surface of the permanent magnet (5) and the locking plate (1) are required.
It suffices that the upper surface of 1) is in close contact in parallel. Therefore,
It is desirable to incline the lumen (6) of the suction fitting (3) so that the surface of the permanent magnet (5) is lowered forward by about 10 degrees with respect to the horizontal plane.

Yoke (7) used in combination with permanent magnet (5)
May have the same shape and the same size as the end face of the permanent magnet (5) to be used. (14) may be used. The projecting portion (14) has the effect of extending the reach of the line of magnetic force in the projecting direction, albeit slightly. In the case where the protruding portion (7) is provided (FIG. 5-B,
D) Since the direction of the attraction force of the permanent magnet (5) can be changed,
The projection (14) of the yoke (7) is oriented in the direction opposite to the door (1), and the yoke (7) is inserted into the cavity (6) of the suction fitting (3).
Attach to

[0017]

Since the magnetic door stop of the present invention is constructed as shown in the drawings and the above description, the following effects can be obtained.

Since the magnetic door fitting of the present invention does not have a columnar support fixed to the floor or baseboard, it does not hinder traffic or floor cleaning.

Since a permanent magnet having a special shape is not required and a commercially available permanent magnet can be used, it can be supplied at a low cost.

Further, the adsorbent is constituted by using a yoke (unsaturated yoke) which does not saturate the magnetic field lines of the built-in permanent magnet together with the permanent magnet, and the magnetizing direction of the magnet is appropriately determined. So that the highest magnetic force of the interior magnet can be demonstrated. Therefore, manufacturing costs can be reduced by using smaller permanent magnets.

Since the structure is simple and there is no special restriction on the method of use, there is no uncomfortable feeling in use. That is, when the door is opened, it stops automatically at a fixed position, and the door is locked at that position. When the locked door is pulled, the attraction magnet separates from the locking plate and the door can be closed.

[Brief description of the drawings]

FIG. 1 is a side view of the metal fitting of the present invention, showing a main part in a cross section;

[Figure 2] Similarly, the bottom view of the suction fitting,

FIG. 3 is a perspective view showing the whole;

FIG. 4 is a side sectional view showing an assembling procedure of the suction fitting.

FIG. 5 shows examples of various attracting magnets.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Door 2 ... Floor 3 ... Attachment bracket 4 ... Locking bracket 5 ... Permanent magnet 6 ... · Lumen 7 ························································································ 12 Rotating shaft 13 Receptacle 14 Projection of yoke t Thickness of yoke

Claims (4)

[Claims] 1. A door stop fitting for holding an opened door at that position in a building, comprising: a suction fitting (3) attached to a lower end of an open side surface of the door (1); At the stop position, a lock fitting (4) dug and attached directly below the suction fitting (3). The magnetic line of magnetic force of the permanent magnet used is not saturated in the lumen (6) on the lower surface of the suction fitting (3). A magnetic metal yoke (7) having a thickness (t) and a permanent magnet (5) magnetized in the depth direction of the lumen (6) are attached and fixed in this order, and the locking metal fitting (4) A magnetic door stop fitting comprising a magnetic metal locking plate (11) rotatable only upward at the center of the upper surface. 2. The metal door stop according to claim 1, wherein the size of the magnetic metal yoke is the same as the size of the end face of the permanent magnet used. 3. The magnetic door stop according to claim 1, wherein the size of the magnetic metal yoke is larger than the size of the end face of the permanent magnet used. 4. A magnet type magnet according to claim 1, wherein the magnetic metal yoke (7) is provided with a protrusion (14) whose size is increased only in one direction of the end face of the permanent magnet (5) to be used. Door stop fittings.