JPH0312134Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement in a door opening/closing magnetic catcher used in a single-opening type door with one end pivoted, which is used for a storage box or the like.

[Prior art] Recently, door opening/closing devices for storage boxes and the like use magnets and springs.When pressed, the door locks, and when pressed further, the door releases and returns to its previous position.A magnet is attached to one end of the door. A holding device with a holder and an adsorption piece that is attracted to the magnet are provided between the box main body and the door, so that when the door is pressed toward the box main body, the free end of the door protrudes from the box main body. The door can be opened completely by pulling the protruding door outward to release the engagement between the magnet and the adsorption piece (for example, Japanese Patent Publication No. 47-47430), or the door can be pushed apart using a holding device. There are things like this.

[Problem to be solved by the invention] However, in the door opening/closing device described above, the door does not open naturally due to vibrations, etc., or does not open easily due to the slightest shock, and the door does not open freely when the door is opened. If the end part is slightly protruded from the main body, the door will be in a half-open state, and the door will need to be opened by hand. In particular, if the door is made of acrylic or thin glass, or if the opening of the cabinet is small, or if the door is small with double doors, etc., there is little inertia and the holding device has little inertia. Powerful extrusion is required, which not only causes unpleasant noises but also causes inconveniences in audio equipment, such as the needle jumping during record playback and damaging the record due to vibration. A large holding device is required,
There were problems such as high costs.

In addition, in order to make it possible to push the door away even with a weak ejection pressure, a yoke attached to both sides of the magnet is made to protrude toward the door when the door is ejected in order to reduce the lines of magnetic force on the attraction surface. However, it is necessary to slide the yoke against the attraction force of the magnet, which increases the size and cost of the device.Also, by twisting the relative position of the magnet and yoke to the neutral position, the magnetic force of the yoke can be reduced. Even in the case where the twisting force is reduced, there is frictional resistance during twisting, and this also has drawbacks such as the high cost of the device as described above.

[Technical Issues] The magnetic catcher for opening and closing doors according to this invention was proposed to solve the above-mentioned issues.It is a simple device that strongly attracts the door when it is closed, and does not attract it when the door is opened. The technical challenge is to weaken the force.

[Technical means] In order to solve the above-mentioned technical problem, it consists of a holding device with a magnet attached to one end and an adsorption piece, which locks when pressed and releases the lock when pressed further and returns to the previous position. The holding device consists of a main body and a cylindrical body into which the main body is slidably inserted, and the main body has a frame in the front half into which a magnet is fitted, and the front wall thereof is lined with slits through which the front end of the yoke is exposed. A yoke is attached to both sides of the magnet to be fitted into the frame, and the front end of the yoke has shoulders formed with different widths on both sides of the front end of the yoke. In addition to being fitted into the slit, grooves are provided on the outer surface of the yoke on both sides of the magnet and on the inner surface of the cylindrical body in sliding contact with the main body, which have protrusions that engage with each other and an inclined surface that the protrusions contact in the direction of movement of the main body. To provide a magnetic catcher for opening and closing a door, in which the side of the yoke with the larger notch width protrudes outward from the cylindrical body side as the main body moves in and out.

[Example] Hereinafter, an example of the magnetic catcher for opening and closing a door according to this invention will be described with reference to the drawings.

1 indicates the holding device, 2 indicates the main body of the holding device, 3
1 is a cylindrical body of the holding device 1 into which the main body 2 is slidably inserted, and is made of synthetic resin.

The main body 2 has a prismatic shape, the front half has a frame 4 for fitting a magnet, the rear half has a roughly H-shaped cross section, a spring mounting part 5 in the lower half, and a guide groove 1 in the bottom of the upper half.
The cylinder body 3 is rectangular and has mounting parts 3a protruding from both sides, the front end 3b is an opening through which the main body 2 appears, and the rear end 3c has a pin locking part 7. is provided protrudingly, and an opening 3d for pin insertion is provided.

A ferrite magnet 8 is fitted into the frame 4 of the main body 2, and yokes 9 are attached to both sides of the magnet. The front end 9a is fitted into two slits 11 opened in parallel in the front wall 2a of the main body 2 while being regulated by the shoulders 9b and 9c, and the front end 9a of the main body 2 The yoke 9 slightly protrudes from the wall 2a and has a front end 9a that serves as a suction surface, and the yoke 9 has a protrusion 12 at the rear end of the outer surface and is provided on the inner surface of the cylinder 3 with which the main body 2 slides. In this embodiment, the groove 13 is formed by a deep notch with respect to the moving direction of the yokes 9, 9 and is inclined toward the shoulder portion 9c, or both sides are inclined toward the inner center of the inner surface. The yoke 9 is engaged with a tapered groove, etc., and as the main body 2 slides, the yoke 9 is tilted, and its front end 9a protruding from the slit 11 is inclined. A non-slanted relief portion 13a is provided. In addition, when the groove 13 is provided on the side of the cylinder 3, due to the molding of the cylinder 3 made of synthetic resin, the groove is formed by one side parallel to the outer surface and a predetermined inclined side, and after the mold is removed, the wedge-shaped piece 13b is formed. A predetermined groove 13 is obtained by attaching the groove. In addition, in order to prevent contact with the inner bottom wall surface of the main body 2 when the yoke 9 is tilted, a relief 9d is cut out from the shoulder 9c of the front end 9a to the width C of the rear end, so that the yoke 9 can be easily tilted. It is configured. A coil spring 14 is attached to the mounting portion 5, and elastically urges the main body 2 toward the front of the cylinder 3. Furthermore, an M-shaped locking portion 15a is provided at the front end of the guide groove 15 installation surface, and an M-shaped locking portion 15a is provided at the rear end of the guide groove 15 installation surface. A guide groove 15 having a V-shaped locking part 15b at the end is bored, and a pin hole 16 is provided in the operating pin locking part 7 protruding from the rear end of the cylinder 3. Between the guide grooves 15, L-shaped bent portions 17 are provided at both ends.
a, 17b, one bent portion 17a is slidably slidable into the guide groove 15 through the rear end opening 3d of the cylinder body 3, and the other bent portion 17b is slidably inserted into the pin hole 16. The holding device 1 is attached to the door frame 18 by the mounting portions 3a extending on both sides of the cylinder body 3.
At the same time, an adsorption piece 20 that adsorbs to the front end 9a of the yokes 9, 9 is installed at a required location on the door 19.

Reference numeral 21 denotes a retaining ring that prevents the operating pin 17 from falling off.

When the door is closed, the main body 2 of the holding device 1 is housed in the cylindrical body 3, and the front end 9a of the yoke 9 is
The surface is parallel to the front wall 2a of the main body 2 and parallel to the suction surface of the suction piece 20, and the front end 9a is entirely parallel to the suction piece 2.
0, and when opening the door, the closed door 19
If you push further in the closing direction, the main body 2 will release the spring 14.
, the protrusion 12 of the yoke 9 once retreats into the relief part 13a of the groove 13, and then, when the hand pushing the door is released, the front half of the main body 2 becomes a cylinder due to the action of the spring 14. 3 and the yoke 9
The protrusion 12 slides in the groove 13 to tilt the front end 9a of the yoke 9 with respect to the suction piece 20, and in the case of the other grooves described above, when the main body 2 protrudes, the door 19 is pushed out, and the door itself The yoke 9 moves in the direction of opening the door due to the inertia of the yoke 9 and tries to protrude while adhering to the surface of the adsorption piece 20, but one shoulder 9b comes into contact with the thick part 2b of the main body 2 and is prevented from protruding. other shoulder 9
Only c protrudes, the yoke 9 is tilted, and the contact between the two changes from surface contact to line contact.

The attraction force is roughly determined by the number of lines of magnetic force per unit area, but there is a limit to the amount of lines of magnetic force that can pass through per unit area, and it also has the property of weakening in inverse proportion to the square of the distance between the attraction surfaces, so the above-mentioned Due to the operation, the attraction force between the front end 9a of the yoke 9 and the surface of the attraction piece 20 at the portions separated from each other decreases, and furthermore, the contact portion also comes into line contact and the attraction force decreases.

Further, due to the operation of the main body 2, the L-shaped bent portion 17a of the operating pin 17 between the cylinder body 3 and the main body 2 advances as shown by the solid arrow in FIG. 4, and becomes V-shaped as shown in FIG. It locks in the locking part 15b, stops the protrusion of the main body 2, and the door 1 is removed from the front end 9a of the yoke where the suction force has decreased.
9 is easily separated and opened due to inertia, and the door can be opened without having to put a hand on the door and pull it.

In addition, when closing the door, when the door 19 is pressed against the door frame 18, the suction piece 20 comes into contact with the corner of the inclined front end 9a of the yoke, and by further pressing, the main body 2 is pushed into the cylindrical body 3 against the spring 14. At the same time, the L-shaped bent portion 17a of the actuating pin 17 retreats as shown by the solid arrow in FIG. The protrusion 12 of the yoke 9 slides in the groove 13 to return the yoke 9 to its original position, and the front end 9a of the yoke becomes parallel to the surface of the suction piece 20, expanding the suction area. , the suction force increases and the door 19 is brought into close contact with the door frame 18.

Note that the slit 1 in the front wall 2a of the main body 2 of the holding device 1
The front end 9a of the yoke exposed from the door 19 operates in the same manner whether it is parallel to or perpendicular to the free edge of the door 19.

[Effects] The magnetic catcher for opening and closing doors according to this invention configured as described above is attached to a storage box, etc., and when the door is closed, the magnet catcher is attached to a suction piece attached to the door and a holding device attached to the door frame of the box body. The front end of the yoke on both sides of the magnet forms a surface contact and forms a magnetic closed circuit so that it strongly attracts the magnet. When the door is opened, the main body tilts the front end of the yoke with respect to the attraction piece due to the spring pressure and protrudes to attract the attraction piece. The front end of the yoke is brought into line contact with the front end of the yoke to gradually reduce the lines of magnetic force passing through the adsorption surface, and even if the main body stops protruding, the door will naturally separate from the front end of the yoke and be released due to the inertia of the door itself. There is no sound or vibration when the door is ejected due to a large ejection force, there is no need to increase the size of the device, and the door can be opened and closed quietly without having to touch the door, and the cost increase can be suppressed. It is promised.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the magnetic catcher for opening and closing doors according to this invention, Fig. 2 is a longitudinal sectional view of the same when the door is closed, and Fig. 3 is a longitudinal sectional view of the same when the door is opened. 4 is a partially cutaway plan view when the door is closed, and FIG. 5 is a perspective view of the yoke and the groove portion on the inner surface of the cylinder. DESCRIPTION OF SYMBOLS 1... Holding device, 2... Main body, 2a... Front wall, 3... Cylindrical body, 4... Frame part, 8... Magnet, 9... Yoke, 9a... Front end, 9b, 9c... Shoulder part, 11... Slit, 12...
Projection, 13... Groove, 14... Spring, 15... Guide groove, 1
7... Operating pin, 18... Door frame, 19... Door, 20 Adsorption piece.

Claims (1)

[Scope of utility model registration request] It locks when pressed, and releases the lock when pressed further and returns to the previous position. It consists of a holding device with a magnet attached to one end and an adsorption piece, and the holding device is inserted into the main body so that it can slide freely. The main body has a frame part in the front half into which the magnet is fitted, and the front wall of the main body has slits from which the front end of the yoke protrudes, and the magnet fitted in the frame part has a frame part on both sides. The front end of the yoke, which has a yoke attached to the surface and shoulder parts with different notches and different widths formed on both sides of the front end of the yoke, is inserted into the slit, and the outer surface of the yoke on both sides of the magnet and the main body are inserted. The inner surface of the cylindrical body that is in sliding contact is provided with protrusions that engage with each other and a groove that has an inclined surface in contact with the protrusions in the direction of movement of the main body, so that as the main body moves in and out, the yoke is moved so that the side of the yoke with the larger notch width A magnetic catcher for opening and closing a door, characterized in that it is held so as to be tiltable so as to protrude outward from the cylindrical body side.