JP7475679B2 - Door bottom device - Google Patents

Description

This invention relates to a door bottom device for use with doors, such as swing doors and sliding doors.

FIG. 5 is an explanatory diagram showing a state in which a conventional door bottom device is attached to a hinged door.
This door bottom device comprises a case body 78 fixed to the door A, a leaf spring 71 arranged within the case body 78, a curvature changing means for setting the radius of curvature of the leaf spring 71 large in a normal state and changing the radius of curvature of the leaf spring 71 to a smaller value when the door is closed, and an airtight gasket 77 connected to the curvature changing means and protruding from and retracting into the case body 78.

The curvature changing means is composed of a spring fixing plate 73 that fixes one end of the leaf spring 71 to the inner wall of the case body 78, an attachment plate 72 that fastens the other end of the leaf spring 71, and a retractable member 75 that is attached to the attachment plate 72 via a return spring 74 and protrudes outside the door A in the normal state.

When door A is open, the leaf spring 71 is curved gently, and there is a gap between the airtight packing (packing frame 77a) 77 attached to the leaf spring 71 via the support 76 and the floor surface D. As shown in Figure 5, when door A is closed, the retractable member 75 hits the vertical frame (hanging vertical frame) E and is pushed into the case body 78.

This causes the return spring 74 to compress, the mounting plate 72 to move toward the door edge, and the distance between the mounting plate 72 and the fixed plate 73 to decrease. As a result, the radius of curvature of the leaf spring 71 decreases (the degree of curvature increases), and the integrated airtight packing (packing frame 77a) 77 descends, closing the gap between it and the floor surface D.

Patent No. 5687530

In door bottom devices that raise and lower the airtight gasket by the appearance and disappearance of a protruding member, the protruding member is pushed in just before the door is completely closed (for example, when the door opening angle is about 20 to 30 degrees). As a result, the door closes with the airtight gasket in contact with the floor surface. This has the disadvantage that the floor surface may be scratched and the door may be difficult to open and close.

In addition, if the door is accidentally closed too forcefully, or if the door is closed forcefully against the will due to wind pressure or other reasons, not only will the door be damaged by a collision with the door-opening element, but the door-opening element itself may be damaged, or the return spring that connects to the door-opening element may be damaged.

In other words, not only is the curvature-changing means responsible for raising and lowering the airtight packing unstable, but in the case of suspended sliding doors, the door will open due to the repulsive force of the retractable part, and there are other disadvantages, such as the inability to use a soft closer due to the repulsive force of the retractable part and the frictional force of the airtight packing.

The purpose of this invention is to provide a door bottom device that solves the above problems, ensures that the timing of the packing rising and falling is appropriate, there is no risk of damaging the floor surface, the door opens and closes smoothly, and because the packing rises and falls by magnetic attraction, there is no risk of damage to the return spring or vertical frame.

In order to achieve this objective, the door bottom device of this invention is configured as follows. The door bottom device is characterized by comprising a case body 1 fixed to the door A, a horizontally movable slide plate 2 arranged inside the case body 1 and biased toward the hanging vertical frame E by a return spring 5, a movable arm 3 whose orthogonal portion 31 is rotatably supported by the case body 1, a long piece portion 32 continuing from the orthogonal portion has a gasket 6 attached thereto, and whose short piece portion 33 is connected to the slide plate 2, and an attraction means 4 equipped with a fixed magnet 42 on the door end vertical frame B corresponding to the magnet 41 on the slide plate 2, which attracts the slide plate 2 when the door A is closed.

In a door bottom device having such a configuration, the suction means operates when the door is closed to lower the packing, so the packing does not move while the door is opening or closing. Therefore, there is no risk of the packing scratching the floor surface, and the door can be opened and closed smoothly.

In addition, the magnet at the tip of the slide plate is attracted by a fixed magnet in the vertical door frame, which links the slide plate and the movable arm to lower the packing, ensuring the stability of the structure without risking damage to the vertical frame or the return spring that biases the slide plate.

Not only is the suction means that raises and lowers the packing highly stable, but it also has the excellent effect of eliminating the drawback of hanging sliding doors, where the door opens due to the repulsive force of the retractable part, and the inability to use a soft closer due to the friction between the repulsive force of the retractable part and the airtight packing.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a door bottom device according to the present invention will be described with reference to the drawings.
The door bottom device, as shown in Figure 1, comprises a case body 1 fixed to the door A, a horizontally movable slide plate 2 arranged within the case body 1 and urged toward the hanging vertical frame E by a return spring 5, a movable arm 3 whose orthogonal portion 31 is rotatably supported on the case body 1 and has a gasket 6 attached to a long piece portion 32 continuing from the orthogonal portion and whose short piece portion 33 is connected to the slide plate 2, and an suction means 4 which arranges a fixed magnet 42 on the door end vertical frame B in correspondence with the magnet 41 of the slide plate 2.

The case body 1 is made of plastic, for example ABS resin, and is molded into a U-shaped cross section with openings 1d on both ends, consisting of a top plate 1a and side plates 1b and 1c. In Fig. 1, the case body 1 is embedded in a square groove on the bottom surface of door A, the end surface on the door tip side being open. Fig. 4 shows an example in which the case body 1 is attached to the lower outer surface of door A (at a height close to the floor).

FIG. 2 is an enlarged perspective view showing the main part of the door bottom device, and shows the relationship between the slide plate 2, the movable arm 3 and the packing 6 within the case body 1.
A bearing cylinder 11 is provided on the inner side of the side plate 1c at the rear of the case body 1 to protrude inward, and a central orthogonal portion 31 of a movable arm 3, which will be described later, is fixed to a shaft 12. Furthermore, a guide bar 13 consisting of an upper piece 13a and a lower piece 13b is provided on the inner surface of this side plate 1c to guide the horizontal movement of a slide plate 2, which will be described later.

The movable arm 3 is an L-shaped plastic flat plate in which a long piece 32 and a short piece 33 are connected via an orthogonal part 31, which is a cylinder with a large diameter cylindrical part 31a and a small diameter cylindrical part 31b connected in a stepped manner. When the end face of the small diameter cylindrical part 31b contacts the end face 11b of the bearing cylinder 11 of the case body 1, the large diameter cylindrical part 31a, the small diameter cylindrical part 31b, and the shaft hole 11a of the bearing cylinder 11 are connected.

In this state, when the shaft 12 is inserted from the large diameter cylindrical portion 31a side and the shaft tip portion 12b is fitted into the shaft hole 11a, the shaft head portion 12a fits inside the large diameter cylindrical portion 31a and the movable arm 3 is rotatably attached to the case body (inner surface of the side plate 1c) 1. In this embodiment, two movable arms 3 are provided with an appropriate distance between them (Figure 1). Also, as shown in Figure 3, the entire packing 6 including the packing mounting frame 61 or airtight packing portion 62 is divided into two, left and right, and each is raised and lowered by a separate movable arm 3, thereby improving the accuracy of the raising and lowering operation.

In addition, an attachment hole 32a is opened in the tip surface of the long piece 32 of the movable arm 3, and a gasket 6, which will be described later, is attached to it. In addition, a small-diameter protruding shaft portion 33a is provided at the tip of the short piece portion 33 of the movable arm 3, protruding inward, and is connected to the slide plate 2, which will be described later.

The slide plate 2 is a long, rectangular, flat plate made of plastic, and its back side is supported by a guide bar (upper and lower pieces 13a, 13b) 13 so that it can slide along the side plate 1c of the main case 1. In the normal state, the slide plate 2 is biased toward the hanging vertical frame E by a return spring 5, and the magnet 41 at the tip of the slide plate 2 is positioned at the opening end face 1d of the case body 1.

The slide plate 2 has a rectangular flat plate portion 21 with a window hole 22 opening in its surface protruding towards the side plate 1b. This window hole 22 is formed in a vertical wall 22a at its base end and a curved wall 22b at its tip end. One end of a spring 23 is attached to the vertical wall 22a, and the other end of the spring 23 is attached to the protruding shaft portion 33a of the movable arm 3. The protruding shaft portion 33a is pressed against the curved wall 22b by the spring 23, and maintains the upward (elevation) shape of the long piece portion 32 in the normal state.

The packing 6 is made up of a plastic mounting plate 61 having a width roughly the same as that of the door (case body 1) A, and a rubber airtight packing part 62 that is continuous with the lower end of the mounting plate 61. A mounting shaft part 61a protrudes inward from the upper edge of the mounting plate 61, and is fitted into the mounting hole 32a of the movable arm 3 and attached in a hanging manner.

As shown in FIG. 1, the suction means 4 is composed of a magnet 41 in the resin frame portion at the tip of the slide plate 2 and a fixed magnet 42 provided on the door end vertical frame B.
When the door A is in an open state, the magnetic pole surface of the magnet 41 at the tip of the slide plate 2 is substantially flush with the opening end surface 1d of the case body 1.

When door A is closed, magnet (magnetic north pole face) 41 and fixed magnet (magnetic south pole face) 42 approach each other and perform an attraction action. In Fig. 1, the fixed magnet 42 is provided with a recess 42a in the door end vertical frame B corresponding to the magnet (north pole face) 41, and is arranged so that the magnet 42 face (south pole face) is aligned flush with the face of the vertical frame B. Also, in the example of Fig. 4, the fixed magnet 42 is affixed to the door stop C of the door end vertical frame B corresponding to the case body 1 on the outer surface of door A.

Magnets 41 and fixed magnets 42 are made of ferrite magnets, neodymium magnets, or the like. In this embodiment, a permanent magnet (neodymium magnet) with a magnetic force of 3800 G (380 mT) and dimensions of 22 mm x 5 mm x 4 mm is used. In other words, a magnet with a magnetic strength strong enough to attract slide plate 2 and allow children to relatively easily separate it is used.

In the door bottom device having such a configuration, as shown in FIG. 1, when the door A is slightly open, the slide plate 2 is pulled by the return spring 5, and the end face of the tip magnet 41 is aligned flush with the opening end face 1d of the case body 1.
Here, there is a small gap between the magnet 41 and the fixed magnet 42, so that no magnetic force acts and the slide plate 2 does not move.

In this state, the protruding shaft portion 33a of the short piece portion 33 of the movable arm 3 is biased toward the tip by the spring 23, and the long piece portion 32 is held facing upward. The packing (airtight packing portion 62) 6 is pulled up and stored inside the case body 1. Therefore, until the door A is completely closed, the packing 6 does not move, and the door A can be opened and closed smoothly.

When door A is completely closed, as shown in Figure 3, the distance between the corresponding magnet 41 and fixed magnet 42 narrows, and they come close to each other and attract each other. This magnetic force causes the slide plate 2 to move forward against the return spring 5, and the end face of the attracted magnet 41 protrudes beyond the open end 1d of the case body 1.

At this point, the movable arm 3 rotates and the long piece 32 descends, causing the connected packing 6 to descend. In other words, the continuous lower airtight packing part 62 comes into contact with the floor surface D. Furthermore, if the packing 6 hits an obstacle (such as a coin) on the line of descent, a compressive force acts on the spring 23, controlling the rotation of the movable arm 3 to stop the position of the packing 6, thereby ensuring safety by preventing damage to the device.

FIG. 1 is an explanatory diagram showing a door bottom device according to an embodiment. FIG. 2 is an enlarged perspective view showing a main part of the door bottom device. FIG. 4 is an explanatory diagram showing an operating state of the door bottom device. FIG. 2 is a perspective view showing a state in which the door bottom device is attached to the door. FIG. 1 is an explanatory diagram showing a conventional door bottom device.

1 Case body
2 Slide plate 3 Movable arm
4 Suction means 5 Return spring
6 Gasket 11 Bearing sleeve 12 Shaft 13 Guide bar
21 Rectangular flat plate portion 22 Window hole 23 Spring 31 Orthogonal portion 32 Long piece portion 33 Short piece portion 41 Magnet 42 Fixed magnet A Door (opening door)
B Door end vertical frame
C Door stop D Floor surface E Hanging vertical frame
71 Leaf spring
72 Mounting plate
73 Fixing plate
74 Return spring 75 Appearance
77 Gasket

Claims (5)

A door bottom device characterized by comprising a case body fixed to the door, a horizontally movable slide plate that is attached to the case body and biased toward the hanging vertical frame by a return spring, a movable arm whose orthogonal part is rotatably attached to the case body, a gasket is attached to the long piece part that is continuous with the orthogonal part, and whose short piece part is connected to the slide plate, and a suction means that has a fixed magnet on the door end vertical frame corresponding to the magnet on the slide plate and attracts the slide plate when the door is closed. The door bottom device according to claim 1, characterized in that the slide plate is provided with a rectangular flat plate portion with a window opening, and the protruding shaft portion of the short piece of the movable arm that fits into the window opening is spring-loaded to hold the long piece in an upward position when the door is open. The door bottom device according to claim 1, characterized in that the magnetic pole surface of the magnet at the tip of the slide plate is held against the open end surface of the case body when the door is open, and when the door is closed, the magnetic pole surface of the slide plate comes close to the fixed magnet and is attracted to the fixed magnet. The door bottom device according to claim 1, characterized in that when the slide plate moves toward the door end vertical frame due to suction by the suction means, the movable arm rotates, displacing the long piece downward and lowering the packing. 2. The door bottom device according to claim 1, wherein the packing is divided into two parts, left and right, and each packing is raised and lowered by a corresponding individual movable arm.

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