JPH0312136Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of a magnetic catcher for opening and closing doors used for doors of storage boxes and 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, it releases the lock and returns to its previous position.A magnet is attached to one end of the door. A holding device and an adsorption piece that is attracted to the magnet are provided between the box body and the door, so that when the door is pressed toward the box body, the free end of the door protrudes from the box body, and the protrusion There are some devices in which the door can be completely opened by pulling the door outward to release the engagement between the magnet and the adsorption piece, and others in which the door is pushed apart by a holding device.

[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 only slightly protrudes from the main body, the door will not separate from the magnetic catcher, and it will be necessary to open it by hand, which is inconvenient. If the end is made to protrude slightly from the main body, there will be problems such as the need to open it by hand. If the end is made to protrude slightly from the main body, there will be problems such as the need to open it 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. Furthermore, stronger extrusion is required, which not only causes unpleasant noises but also causes inconveniences in audio equipment, such as vibrations that cause the needle to jump and damage the record. However, a large holding device was required, which caused problems such as high cost.

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 the same problems as above, such as increasing the cost of the device.

[Technical Problem] The magnetic catcher for opening and closing doors according to the present invention was proposed to solve the above problems, and is a simple device that strongly attracts the door when closing.
The technical challenge is to weaken the suction force when opening the door so that the door can be pushed out.

[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, which has shoulders formed by notches on both sides, is fitted into the slit and the inner surface of the front wall of the frame. is provided with a thick part that engages with one shoulder of the yoke, and the outer surface of the yoke on both sides of the magnet and the inner surface of the cylindrical body with which the main body slides are provided with protrusions that engage with each other and that extend in the direction of movement of the main body. A groove having an inclined surface in contact with the protrusion is provided,
The yoke is capable of engaging the yoke so that the side of the shoulder portion of the main body that is moved toward the protruding side from the cylindrical body that does not engage the thick portion of the front end of the yoke is protruded outward from the slit. Provides a magnetic catcher for opening and closing doors.

[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 both are 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 yoke 9 has shoulders 9b formed by notches on both sides of the front end 9a. , the front end 9a is fitted into two slits 11 opened in parallel on the front wall 2a of the main body 2, and the inner surface of the front wall 2a has a round body on which one shoulder 9b of the yoke 9 engages. The yoke 9 has a shoulder portion 9b restricted by the thick portion 2b, and its front end 9a slightly protrudes from the front wall 2a of the main body 2, so that its front end surface 9a' serves as a suction surface. It is composed of The yoke 9 is provided with a protrusion 12 at the center of 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. Protrusion and retraction of the main body 2 with respect to the cylindrical body 3, such as a groove as in the present embodiment that engages with the protrusion 12 that is inclined toward the opposite side of the cylindrical body 2b, or a groove that has a tapered shape with both sides inclined towards the inner center of the inner surface. Accordingly, a groove is provided so that the protrusion 12 of the yoke 9 can freely flex toward the opposite side of the thick portion 2b with respect to the center line.

The groove 13 is provided with a short, non-inclined relief part 13a at the rear end, and when the groove 13 is formed on the cylinder 3 side as shown in FIG. Depending on the molding relationship, the groove may be formed by one side parallel to the outer surface and a predetermined inclined piece, and after the mold is removed, a predetermined inclined groove 13 with a wedge-shaped piece 13b attached thereto can be obtained. In addition, in order to prevent contact with the inner bottom wall surface of the main body 2 when the yoke 9 is tilted, relief notches 9c, 9c are respectively provided at both ends of the yoke 9, extending from the shoulders 9b, 9b of the front end surface 9a' to the width c of the rear end. , York 9
It is constructed so that it can be easily tilted. The reason for providing them on both sides is to ensure compatibility of the yokes.
A coil spring 14 is attached to the spring attachment portion 5 to resiliently bias the main body 2 toward the front of the cylinder 3, and an M-shaped locking portion 1 is provided at the front end of the guide groove 15 installation surface.
5a, a guide groove 15 having a V-shaped locking part 15b is bored at the rear end, and a pin hole 16 is provided in the operating pin locking part 7 protruding from the rear end of the cylinder body 3. An operating pin 17 having L-shaped bent portions 17a and 17b at both ends between the pin hole 16 and the guide groove 15.
is fitted into the holding device 1 with one bent portion 17a slidably fitted into the guide groove 15 and the other bent portion 17b into the pin hole 16 through the rear end opening 3d of the cylinder body 3. The cylindrical body 3 is attached to the door frame 18 by means of attachment portions 3a extending on both sides thereof, and adsorption pieces 20 which are attached to the front end surfaces 9a' of the yokes 9 are attached to required locations on the door 19.

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

[Function] 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 surface 9 of the yoke 9 is
a' is parallel to the front end surface 2a' of the main body 2 and parallel to the suction surface of the suction piece 20, and the front end surface 9a' is fully adsorbed to the suction piece 20, and when the door is opened, the closed door 19 is further When pushed strongly in the closing direction, the main body 2 retreats against the spring 14, and the protrusion 12 of the yoke 9 once retreats into the relief part 13a of the groove 13. After that, when the hand pushing the door is released, the spring 14 As a result of the action, the front half of the main body 2 is pushed out from the cylinder 3, and the protrusion 12 of the yoke 9 slides within the groove 13, causing the front end surface 9a' of the yoke 9 to be inclined with respect to the suction piece 20. In the case of the other grooves mentioned above, when the main body 2 protrudes, the door 19 is pushed out and moves in the door opening direction due to the inertia of the door itself, and the yoke 9 tries to protrude while adhering to the surface of the adsorption piece 20. , since one shoulder 9a abuts against the thick part 2b of the main body 2 and is prevented from protruding, the other shoulder 9
Only b protrudes, tilting the yoke 9, 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 the force weakens 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 surface 9a' of the yoke 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 line arrow in FIG. 5, 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 19 is easily separated from the front end surface 9a' of the yoke, where the suction force has decreased, due to inertia, and is opened without having to put your hand on the door and pull it. The door can.

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 cylinder body 3 against the spring 14. At the same time, the L-shaped bent portion 17a of the actuating pin 17 moves as shown by the solid arrow in FIG. The yoke 9 is fixed in the stored state, and the protrusion 12 of the yoke 9 slides into the groove 13 to return the yoke 9 to its original position, and the yoke front end surface 9
a' becomes parallel to the surface of the suction piece 20, the suction area is expanded, and the suction force is increased to bring the door 19 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.

FIG. 7 shows another embodiment of the yoke 9,
A notch 9c for escape when the yoke 9 is tilted is provided only on one side, limited to the left and right sides, and the posture of the yoke 9 is stabilized when the door is closed.

[Effect] 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 magnetic catcher attached to the door and the holding device attached to the door frame of the box body are used. A magnetic closed circuit is constructed so that the front end surfaces of the yoke on both sides of the magnet come into surface contact and are strongly attracted. When the door is opened, the main body protrudes due to spring pressure and the front end surface of the yoke is tilted to the adsorption piece and attracted. By reducing the lines of magnetic force that pass through the adhesion surface of the front end of the yoke and the front end of the yoke, even if the main body stops protruding, the inertia of the door itself will cause the door to separate from the front end of the yoke and be released, reducing the noise caused by the strong ejection force when ejecting. There is no bending or vibration, there is no need to increase the size of the device, the door can be opened and closed quietly without the need to touch the door, and it also promises to keep costs down.

In addition, since the yoke can be shaped symmetrically, it can be used commonly on both sides of the magnet.
It is easy to manufacture, easy to assemble the yoke, and also contributes to cost reduction by reducing the number of parts.

Also, it is difficult to give the shoulder of the yoke itself a rounded shape, and if the shoulder is formed by punching, burrs are likely to appear.
This may get caught on the sliding surface and prevent smooth tilting, but since we have provided a thick part on the main body side that one shoulder of the yoke engages with, it is possible to create a smooth engagement surface by injection molding. It has the excellent feature of being able to induce smooth tilting of the yoke.

[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 side view of the main body 2, and FIG. 3 is a longitudinal sectional view of the same when the door is closed.
Figure 4 is a vertical cross-sectional view of the door when it is opened, Figure 5 is a partially cutaway plan view when the door is closed, Figure 6 is a perspective view of the yoke and the inclined groove on the inner surface of the cylinder, and Figure 7 is the yoke. FIG. 3 is a front view of another embodiment of the invention. 1... Holding device, 2... Main body, 2a... Front wall,
2a'...Front end surface, 3...Cylinder, 4...Frame, 8...
...Magnet, 9...Yoke, 9a...Front end, 9a'...
Front end surface, 9b, 9b'...Shoulder, 11...Slit, 12...Protrusion, 13...Groove, 14...Spring,
15... Guide groove, 17... 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 in which the front end of the yoke is exposed. A yoke is attached to the surface, and the front end of the yoke, which has shoulders formed by notches on both sides thereof, is fitted into the slit, and the inner surface of the front wall of the frame portion is provided with a thick wall portion on which one shoulder of the yoke engages. The outer surface of the yoke on both sides of the magnet and the inner surface of the cylindrical body in sliding contact with the main body are provided with protrusions that engage with each other and a groove having an inclined surface that is in contact with the protrusions in the direction of movement of the main body. The yoke is capable of engaging the yoke so that the side of the shoulder portion of the main body that is moved toward the protruding side from the cylindrical body that does not engage the thick wall portion of the front end of the yoke is protruded outward from the slit. A magnetic catcher for opening and closing doors.