JPH0343350Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an automatic closing device for sliding doors.

Conventionally, as an automatic closing device for sliding doors, an air cylinder is attached to the upper stile of the sliding door or the upper frame or gap of the door frame, an iron piece or a magnet is attached to the tip of the piston shaft of the air cylinder, and the iron piece or A structure in which a magnet or a piece of iron is attached to the upper frame or inside of the door frame facing the magnet or inside the upper stile of a sliding door is known (for example, Publication No. 33073/1983). However, it is necessary to separately install a steady stop wheel on the upper stile of the shoji frame to prevent the shoji frame from moving sideways, but when installing an air cylinder to the upper stile of the shoji frame, installing the steady stop wheel will open the shoji. As the piston shaft of the air cylinder hits the steady stop wheel, it becomes necessary to install the air cylinder at a higher position, and extra space is required between the upper frame of the shoji mounting frame and the upper stile of the shoji frame. Another problem was that additional aluminum material had to be used, resulting in higher costs.

In addition, if an air cylinder is attached to the upper frame of the shoji frame and a suction bracket is attached to the upper stile of the shoji frame, the piston may The shafts do not operate parallel to each other, causing damage due to contact with the inner wall of the cylinder, or problems such as the inability to open the shoji smoothly.

Therefore, the inventor of the present invention installed a cylindrical rod cover on the inner wall of the air cylinder with a gap between the piston shaft and the shoji mounting frame.Even if the shoji frame is improperly installed, the shoji can be secured without damaging the piston shaft. Although we devised a configuration that could be opened and closed, there was also a slight problem in this case, with dust etc. entering the air cylinder. On the other hand, a cylinder having a structure in which an elastic cover is attached to the piston shaft and slides along the surface of the cylinder as the piston shaft expands and contracts is also known (Japanese Utility Model Publication No. 16043/1983). However, in the case of this cylinder as well, as the elastic cover repeats sliding movement, the dust adhering to the cylinder surface is rubbed between the inner surface of the elastic cover and the cylinder surface and gradually moves inside the cylinder, causing the elastic cover to slide. There is a risk that dust may enter the space between the piston shaft and the piston shaft, and the dust that has entered this space may further enter the inside of the cylinder through the gap between the piston shaft and the cylinder, causing damage to the piston shaft. There was a fear that Furthermore, in the case of a cylinder with an elastic cover that slides along the cylinder surface, the outer diameter of the entire cylinder becomes larger, making it difficult to install it in a narrow space such as between the upper stile of a sliding door and the sliding door mounting frame. There was a big problem. Further, in the case of conventional cylinders, there was a problem that the load caused by the impact when the sliding door was completely closed was directly transmitted to the piston shaft, easily damaging the piston shaft. As a result of further study, the inventor of the present invention found that by attaching a cylindrical body made of foam to the protruding portion of the piston shaft that protrudes outward from the cylinder body, it is possible to prevent the intrusion of dust and the like.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic closing device for a sliding door that can open a shoji without damaging the piston shaft due to dust or the like and can automatically close the shoji.

That is, the present invention provides an automatic closing device for a sliding door, in which an air cylinder 5 is attached to the upper frame 4 of the shoji mounting frame 2, and a suction bracket 9 is attached to the upper stile 14 of the shoji frame 13 of the shoji 3 attached to the shoji mounting frame 2. 1, the air cylinder 5 is made up of a cylinder body 6 and a piston shaft 7 that is slidably inserted into the cylinder body 6 and has a suction plate 10 at its tip that protrudes outward from the cylinder body 6 and connects with the suction bracket 9. , and cylinder body 6
A rod cover 11 that covers the piston shaft 7 with a gap is attached to the inner wall, and a cylindrical body 12 made of foam is fixed to the protrusion 8 of the piston shaft 7 that protrudes outward from the cylinder body 6. The gist of this invention is an automatic closing device for a sliding door, which is characterized by:

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

FIG. 1 shows an automatic closing device 1 for a sliding door, which is an embodiment of the present invention. This closing device 1 is constructed so that it can be opened manually when the shoji 3 attached to the shoji mounting frame 2 is opened, and automatically when it is closed. In the above device 1,
An air cylinder 5 is attached to the upper frame 4 of the shoji attachment frame 2 by an appropriate attachment plate 23, and the air cylinder 5 includes a cylindrical cylinder body 6 and a piston shaft slidably inserted into the cylinder body 6. Consists of 7. The piston shaft 7 has a protrusion 8 that slightly protrudes outward from the cylinder body 6, and has a suction plate 10 at its tip that is connected to a suction bracket 9, which will be described later. A cylindrical rod cover 11 is fitted onto the inner wall of the cylinder body 6 near the outlet, with one side protruding outward. This rod cover 11 has an inner diameter larger than its outer diameter so as to have a gap with the piston shaft 7, and the inner diameter is configured to gradually increase as it goes inside the cylinder body 6. A cylindrical body 12 made of foamed rubber such as foamed neoprene rubber or foamed synthetic resin is fitted into the protrusion 8 of the piston shaft 7 . This cylindrical body 12 is mounted so that one end is in contact with the suction plate 10 and the other end is in contact with the end wall of the rod cover 11 to close the gap between the piston shaft 7 and the rod cover 11. A suction bracket 9 to be connected to the suction plate 10 is attached to the upper stile 14 of the shoji frame 13 of the shoji 3. The suction bracket 9 has a magnet 15, and is joined to the suction plate 10 by its magnetic force. Vertical frame 16 of shoji frame 13
is provided with a weight 19 fixed to one end of a rope 18 wound around a suitable pulley 17.
The other end is fixed to the vertical frame 20 of the shoji mounting frame 2 by an appropriate method. The weight 19 is pulled upward when the shoji 3 is opened, and falls due to its own weight when the shoji 3 is closed, thereby functioning to automatically close the shoji 3. A steady stop wheel 21 is provided on the upper stile 14 of the shoji frame 13 to prevent the shoji 3 from wobbling sideways when opening and closing. Further, the air cylinder 5 is provided with a needle valve 22 for adjusting the opening/closing speed of the shoji 3.

Next, the operation of the automatic closing device 1 in the sliding door of the present invention having the above-mentioned configuration will be explained.

First, when opening the shoji 3 manually in the direction of the arrow in FIG. Since the suction plate 10 is magnetically joined to the suction bracket 9 attached to the upper frame 14, the piston shaft 7 is stretched as the suction plate 10 moves. When the shoji 3 is further moved in the opening direction, the suction bracket 9 and the suction plate 10 are disengaged when the piston shaft 7 extends to the maximum. After the shoji 3 is opened, this shoji 3 is automatically closed. This closing action occurs because the lifted weight 19 falls due to its own weight, so the rope 1
8, the shoji 3 is pulled in the opposite direction to the arrow. However, weight 19
If the shoji 3 is only caused by falling, the closing speed of the shoji 3 will be adjusted using the air cylinder 5, since the shoji 3 will be closed rapidly. When the shoji 3 moves in the closing direction, the suction bracket 9 contacts and joins the suction plate 10.
As the movement progresses further, the piston shaft 7 is pushed into the cylinder body 6 by the suction bracket 9. At this time, the air in the cylinder body 6 is removed from the needle valve 22, and the closing speed can be adjusted by adjusting the amount of air removed. When the shoji 3 is completely closed, the piston shaft 7
A cylindrical body 1 made of foam fitted into a protrusion 8 of
2 comes into contact with the end wall of the rod cover 11, and its cushioning action relieves the force applied to the piston shaft 7, and since it comes into close contact with the end wall of the rod cover 11, it is possible to prevent dust and the like from entering the cylinder body 6.

The embodiment of the present invention is constructed as described above, but as long as it does not contradict the gist of the present invention, the shoji mounting frame, the shoji, the upper frame, the air cylinder, the cylinder body, the piston shaft, the protrusion, the suction bracket, the suction plate, the rod cover. The specific shapes, structures, materials, and connection relationships among the cylindrical body, shoji frame, and upper stile can be modified in various ways.

As explained above, according to the present invention, the cylindrical body made of foam is fitted to the protruding part of the piston shaft. This cannot be prevented simply by using a closing device or a conventionally known cylinder with an elastic cover attached to the piston shaft so that it slides along the surface of the cylinder as the piston shaft expands and contracts, as the cylinder of the conventionally known automatic opening/closing device. Since dust can be prevented from entering the cylinder body, the piston shaft will not be damaged or broken, and the load applied to the piston shaft due to the impact when the shoji is completely closed can be reduced by using the cylindrical foam made of foam. This can be relieved by the cushioning action when the body comes into contact with the end wall of the rod cover. In addition, by providing a rod cover on the inner wall of the cylinder body that covers the piston shaft with a gap, if the shoji or shoji mounting frame is not properly installed, the piston shaft will not be damaged even if the piston shaft does not operate in parallel. Moreover, since an air cylinder is attached to the upper frame of the shoji mounting frame, it has various advantages such as easy adjustment of the needle valve, and reliable opening and closing operations.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a cutaway front view showing an automatic closing device for a sliding door of the present invention, and FIG. 2 is a longitudinal cross-sectional view showing the main parts of the device of the present invention. 1... automatic closing device, 2... shoji mounting frame, 3...
...Shoji, 4...Top frame, 5...Air cylinder, 6
... Cylinder body, 7 ... Piston shaft, 8 ...
Projection part, 9... Suction bracket, 10... Adsorption plate, 11... Rod cover, 12... Cylindrical body, 1
3... Shoji frame, 14... Upper stile.

Claims (1)

[Scope of utility model registration request] In the automatic closing device 1 for a sliding door, an air cylinder 5 is attached to the upper frame 4 of the shoji mounting frame 2, and a suction bracket 9 is attached to the upper stile 14 of the shoji frame 13 of the shoji 3 attached to the shoji mounting frame 2. 5 is slidably inserted into the cylinder body 6 and inside the cylinder body 6, and protrudes outward from the cylinder body 6 at the tip thereof to attach the suction bracket 9.
A rod cover 11 is attached to the inner wall of the cylinder body 6 to cover the piston shaft 7 with a gap, and the piston shaft 7 protrudes outward from the cylinder body 6. A cylindrical body 12 made of foam is fixed to the protrusion 8 so as to come into contact with the end wall of the rod cover 11 and close the gap between the piston shaft 7 and the rod cover 11. Automatic closing device for sliding doors.