JPH0315737Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present 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, the door releases 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 that the invention aims to solve) However, in the above door opening/closing device, the door does not open naturally due to vibration etc. or does not open easily due to a small shock, so when the door is opened, If the free end of the door only slightly protrudes from the main body, the door will not separate from the magnetic catcher, and the door will need to be opened by hand. It is necessary to hold the pressure so that the door can be pushed out, especially if the door is made of acrylic or thin glass.
In addition, if the opening of the cabinet is small or the door is small with double doors, etc., there is less inertia, so a stronger push is required, which not only causes unpleasant noises but also causes problems in audio equipment. The vibrations caused problems such as the needle jumping and damaging the record while the record was being played, and a large holding device was required, resulting in 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.

(Problems to be solved by the invention) The magnetic catcher for opening and closing doors according to the invention was proposed to solve the above problems. It has a strong adsorption force, and when the door is opened, the adsorption force is reduced to approximately
The purpose is to make the door weaker and stick out until it weighs less than 300g.The gist of its structure is that it locks when pressed, and when pressed further it releases the lock and returns to its previous position.A magnet is attached to one end. The holding device consists of a holding device and a suction piece, and the holding device consists of a main body and a cylindrical body into which the main body is slidably inserted. Slits exposing the front end of the yoke are arranged in parallel, and a yoke is attached to both sides of the magnet fitted into the frame, and the front end of the yoke, which has shoulders formed by notches on both sides, is inserted into the slit. In addition, protrusions and grooves that engage with each other are provided on the outer surface of the yoke and the inner surface of the cylindrical body where the main body slides, so that the yoke is held so as to be tiltable and returnable as the holding device main body comes and goes. Considerable design changes are planned in line with the gist of the configuration.

(Example) Hereinafter, an example of the magnetic catcher for opening and closing a door according to the present invention will be explained with reference to the drawings. 1 indicates a holding device, 2 indicates the main body of the holding device, 3
The cylindrical body of the holding device 1 into which the main body 2 is slidably inserted is made of synthetic resin.

The main body 2 has a prismatic shape, and the front half has a frame 4 for fitting a magnet, and the rear half has a semi-cylindrical part 5 extending from the frame 4 between both side walls 4a extending from the frame 4. However, a cam groove 6 installation surface is formed on the flat surface of the outer periphery of the semi-cylindrical portion 5. The cylindrical body 3 has a rectangular shape and is provided with mounting parts 3a, 3a extending from both sides, the front end 3b is an opening through which the main body 2 appears, and the rear end 3c is provided with a pin locking part 7 and a pin locking part 7. An opening 3d for fitting 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 in the front wall 2a of the main body 2, and the front end 9a slightly protrudes from the front wall 2a of the main body 2, and the front end surface 9a' is a suction surface. In addition, the yoke 9 has a protrusion 12 at the center of the rear end of the outer surface, and the protrusion 12 is provided on the inner surface of the cylinder 3 on which the main body 2 slides, and is oriented with respect to the center line of the cylinder 3. As the main body 2 slides, the protrusion 12 slides in the groove 13, tilting the yoke 9, and causing the front end surface 9 of the yoke 9 to protrude from the slit 11.
a′ is inclined, and the inclined groove 13
A short, non-slanted relief portion 13a is provided at the rear end. In addition, when the inclined groove 13 is formed on the cylinder body 3 side as shown in FIG. 6, the groove is formed by one side parallel to the outer surface and a predetermined slope piece due to the molding of the cylinder body 3 made of synthetic resin. After forming and cutting, a predetermined inclined groove 13 having a wedge-shaped piece 13b attached thereto may be obtained. In addition, both ends of the yoke 9 are attached to the front end surface 9 to prevent contact with the inner bottom wall surface of the main body 2 when tilting.
It is formed in a tapered shape from the shoulders 9b, 9b of a' to the rear end, so that the yoke 9 can be easily tilted. The reason why both sides have the same shape is to ensure compatibility of the yoke. A coil spring 14 is attached to the semi-cylindrical portion 5 of the main body 2, and urges the main body 2 forward toward the cylinder 3, and the cam groove installation surface 6 has an M-shaped locking portion at the front end. 15a, a cam groove 15 having a V-shaped locking portion 15b at the rear end is bored,
A pin hole 16 is provided in the operating pin locking portion 7 protruding from the rear end of the cylinder 3, and L-shaped bent portions 17a, 17b are provided at both ends between the pin hole 16 and the cam groove 15.
The actuating pin 17 has a hole 3d at the rear end of the cylinder 3.
One bent part 17a can be slid freely into the cam groove 15 through the pin hole 16, and the other bent part 17b can be slid into the pin hole
The holding device 1 is attached to the door frame 18 by the attachment portions 3a protruding from both sides of the cylinder 3, and the holding device 1 is attached to the door frame 18 at required locations on the door 10 to attach to the front end surfaces 9a' of the yokes 9, 9. This is to attach the piece 10'.

(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 9a' of the yoke 9 is parallel to the front wall 2a of the main body 2, and the suction piece 1
It is also parallel to the suction surface of 0', and the entire front end surface 9a' is suctioned to the suction piece 10', and the suction force is approximately
1400g is secured, but when opening the door, if the closed door 10 is further pushed in the closing direction, the main body 2 moves back against the spring 14, and the yoke 9
Once the protrusion 12 retreats into the relief part 13a of the inclined groove 13, and then release the hand that pushed the door, the spring 1
4, the main body 2 is pushed out from the cylindrical body 3, and the protrusion 12 of the yoke 9 slides in the groove 13, making the front end surface 9a' of the yoke 9 inclined with respect to the suction piece 10, and at the same time, the yoke The front end surface 9a' of 9 is attached to the suction piece 1
By tilting it relative to 0', the contact between the two changes from surface contact to point 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 The front end surface 9a' of the yoke and the suction piece 1 separated from each other due to the operation of
The adsorption force between the 0' faces decreases, and the contact area also becomes a point contact, reducing the adsorption force to about 250g.

Further, due to the operation of the main body 2, the L-shaped bent portion 17a of the operating pin 17 between the cylinder 3 and the main body 2 advances as shown by the solid arrow in FIG. 4, and reaches the V-shaped locking portion 15b. The door 10 is locked and the protrusion of the main body 2 is stopped, and the door 10 is easily separated by inertia from the front end surface 9a' of the yoke where the adsorption force has decreased, and the door 10 can be opened without having to put a hand on the door and pull it. .

In addition, when closing the door, when the door 10 is pressed against the door frame 18, the suction piece 10' 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 moves as indicated by the dotted arrow in FIG. The yoke 9 is fixed in the stored state, and the protrusion 12 of the yoke 9 slides in the groove 13 to return the yoke 9 to its original position, and the yoke front end surface 9
a' is parallel to the surface of the suction piece 10', the suction area is expanded, and the suction force is increased to bring the door 10 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 1 operates in the same manner whether it is parallel to or perpendicular to the free edge of the door 10.

FIG. 7 shows another embodiment of the yoke 9,
A notch 9c for relief during tilting is provided on only one side from the shoulder portion 9b to the rear end of the yoke 9, and is limited to left and right use, thereby stabilizing the posture of the yoke 9 when the door is closed.

(Effects) The magnetic catcher for opening and closing doors according to the present invention configured as described above can be attached to a storage box, etc.
When the door is closed, the adsorption piece attached to the door and the front end surface of the yoke on both sides of the magnet of the holding device attached to the door frame of the box body come into surface contact and are magnetically attracted with an adsorption force of 1200g to 1400g. A closed circuit is formed to prevent the door from being opened inadvertently, and when the door is opened, the main body tilts the front end of the yoke with respect to the suction piece, reducing the lines of magnetic force that pass through the suction piece and the front end of the yoke. By using a moderate adsorption force, the door can easily separate from the front end of the yoke and be released due to the inertia of the door itself generated to stop the main body from ejecting over a short distance, and the door can be ejected without the need for a strong ejecting force. There is no noise, vibration, etc., there is no need to increase the size of the device, the door can be opened quietly, and there is no need to assist in opening the door by placing your hand on the door as in the past.
Moreover, it also promises to reduce cost increases.

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.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the magnetic catcher for opening and closing the door according to the present invention, Fig. 2 is a side view of the main body 2, and Fig. 3 is a partially cutaway side view of the magnetic catcher when the door is closed. Fig. 4 is a partially cutaway side view when the door is opened, Fig. 5 is a perspective view of the yoke and the inclined groove portion on the inner surface of the cylinder, and Fig. 6 is a front view of another embodiment of the yoke. . 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, 9a'... Front end surface, 9b, 9b'... Shoulder part, 10...
Door, 11...Slit, 12...Protrusion, 13...Groove, 1
4... Spring, 15... Cam groove, 17... Operating pin, 18
...Door frame.

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, and the magnet fitted in the frame part has a frame part on both sides. A yoke is attached to the surface, and the front end of the yoke, which has shoulders formed by notches on both sides, is fitted into the slit, and the outer surface of the yoke and the inner surface of the cylinder body in sliding contact with the main body are provided with protrusions and inclined grooves that engage with each other. The yoke is tilted as the holding device body comes out and comes out.
A magnetic catcher for opening/closing a door, which is characterized by being able to be held in a freely reversible manner.