JPH09296647A - Magnet catch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fingers or tools from coming into contract to the contact of a switch in an opening and closing state of a door to prevent housing equipments from starting unintentionally. SOLUTION: A switch cover 32 equipped with a magnet member absorbing an absorbed plate, adjoined upward of a rectangular frame-shaped housing 2 mounted to an opening section 1 of an requirement and opening a window section 32A to the front side is mounted by means of a cover mounting device of a pair of elastic arms 33 and 33. A detection switch 31 is covered with the switch cover 32 in a state that a contact 30B and a hinge lever 35 are not projected from the window section 32A to the front side at a stroke front end position and is mounted to the housing 2, at the same, the contact 360B is pushed backward from the stroke front end position by entering from the window section 32A through the hinge lever 35, and a pushing section for closing the detection switch 30 is projected to the absorbed plate.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a magnet catch which is attached to, for example, an opening of a device or a door provided in the opening to hold the door at a closed position by magnetic attraction. The present invention relates to a magnet catch having a function of detecting whether the door is open or closed.

[0002]

2. Description of the Related Art Conventionally, as this type of magnet catch, there is one disclosed in Japanese Utility Model Laid-Open No. Hei 2-118075.
As shown in FIG. 15, this magnet catch houses a switch unit 101 having a micro switch as a main part and an attraction lock unit 103 composed of a magnet body 102 in a single housing 100. The magnetic force attracting portion 104 corresponding to the front end is exposed from the housing 100,
Further, a contact 105 of the switch unit 101 is provided with a required protruding height from the magnetic attraction unit 104 so as to flexibly protrude therefrom, and as shown in FIG.
The closing position of the door 106 is locked by being sucked to the suction plate 107 on the side, the contact 105 of the switch unit 101 is pressed, and the pressing of the contact 105 is released in conjunction with the opening of the door 106, It is configured to protrude from the magnetic attraction unit 104 by a required height.

The magnetic catch constructed as described above is used, for example, in the opening 1 of the copying machine 108 shown in FIG.
09 is mounted on the upper side of one side. In the upper part of the other side of the opening 109, a magnet catch omitting the switch unit 101 and the contact 105, that is, the suction lock unit 103 including the magnet body 102 in the single housing 100.
And a magnet catch having a structure in which a magnetic attraction portion 104 corresponding to a front end of the attraction lock portion 103 is exposed from the housing 100 is attached.

By the way, in the copying machine 108, when the door 106 is opened due to an internal inspection or the like while the storage devices are closed with the power switch (not shown) closed, the open state detection switch is opened. It is considered that the startup of the storage devices is restarted by stopping the startup of the storage devices and closing the door 106 after the completion of the internal inspection and closing the door 106. Therefore, the conventional magnetic catch functions as a magnetic catch that holds the door 106 in the closed position by the magnetic attraction force, and also as a safety switch that detects the open state of the door 106 and stops the activation of the storage devices. Function.

However, when the door 106 is open,
A contact 105 of the switch unit 101 protrudes forward from the magnetic attraction unit 104 by a required height. For this reason, when the inspector's finger or inspection tool or the like accidentally touches the contact 105 during the internal inspection, there is a danger that the storage devices may be unintentionally activated even though the door is open. Have.

[0006]

That is, in the conventional magnet catch, when the door is opened, the contact of the switch portion projects forward from the magnetic attraction portion by the required projecting height. If tools or the like accidentally touch the contactor, there is a risk that the storage devices will start regardless of the door being open. Therefore, the present invention provides a magnet that can reliably prevent the storage devices from unintentionally starting by avoiding fingers or tools from touching the contacts of the switch when the door is open. It is intended to provide a catch.

[0007]

According to a first aspect of the present invention, there is provided a rectangular frame-shaped housing having a front opening and attached to a surface of a member to be mounted. A magnet member which is fitted and held in the housing so as to be displaceable in the front-rear direction and which adsorbs the plate to be attracted at the front side thereof, and which is adjacent to the housing and has a size which does not allow a small finger of a person to enter the front side. A switch cover having an open portion is attached by cover attaching means, and the detection switch is attached to the housing by the switch cover so that the detection switch covers the contact at the front end position of the stroke without protruding forward from the window. Just before the attracted plate is attracted to the attracted plate by the magnet member, enters through the window portion and moves the contactor from the stroke front end position. Pressing portion for actuating the detection switch is pressed is characterized by being projected towards.

According to a second aspect of the present invention, in the first aspect of the present invention, the cover mounting means extend from both sides of the housing and face each other, and are elastically expanded by both lateral surfaces of the switch cover. It is characterized in that it is constituted by a pair of elastic arms having an engaging portion that engages with the switch cover when elastically returned to a natural state.

According to the first aspect of the invention, even if the contact of the detection switch advances to the front end position of the stroke due to the opening of the door, the contact is covered by the switch cover without protruding forward from the window. Therefore, it is possible to prevent fingers and tools from touching the contacts of the switch when the door is open. Immediately before the attracted plate is magnetically attracted to the magnet member by closing the door, the pressing portion enters the switch cover from the window portion of the switch cover and presses and biases the contact element backward from the stroke front end position. The detection switch can be closed.

According to the second aspect of the present invention, the switch cover is pushed between the pair of elastic arms in a state where both lateral surfaces of the switch cover correspond to the opposing surfaces of the pair of elastic arms. When the elastic arm returns to its natural state after being elastically expanded, the engaging portions of the pair of elastic arms engage the switch cover, and the switch cover can be firmly attached to the housing. In addition, since the engagement between the engagement portion and the switch cover is released by pressing the finger portion to elastically expand the pair of elastic arms, the switch cover can be easily removed from the housing.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. 1 to 7 show a state in which a magnet catch M according to the present invention is attached to a side plate 1a of an opening (member to be attached) 1 of a device, and the magnet catch M is a surface 1A of the side plate 1a. The housing 2 has a magnet member 3 fitted and locked in the housing 2 and a pair of elastic plates 4 and 4 for fixing the housing 2 to the side plate 1a. On the side of the opening / closing door 5 which is provided in the opening 1 of the device so as to be openable and closable, an attracted plate 6 made of a magnetic material such as iron is provided facing the magnet catch M.

The magnet member 3 is made of a horizontally long rectangular block-shaped magnet 3a made of anisotropic ferrite, isotropic ferrite or rubber magnet, and a magnetic material such as iron adsorbed on both sides of the magnet 3a. A pair of yokes 3b, 3
b, the front and rear edges of the yokes 3b, 3b are slightly bent toward the magnet 3a so that the yokes 3b, 3b are not accidentally displaced from the magnet 3a. Further, a plurality of (two in this embodiment) locking holes 7 for locking to the housing 2 are provided at the center of each of the yokes 3b, 3b.

The housing 2 is made of a synthetic resin material such as polypropylene, is formed in a rectangular frame shape, and has a long inner surface of an internal space 8 into which the magnet member 3 is inserted from the front opening 2A. A plurality (two in this embodiment) of guide rails 9 are integrally and protruded in parallel with a predetermined interval along the fitting direction E of the magnet member 3, and the magnet members are arranged along the respective guide rails 9. 3
Can be smoothly fitted into the internal space 8. Also,
Each yoke 3 is provided substantially at the center of each guide rail 9.
When the magnet member 3 is pushed into the internal space 8, the rear end edges of the yokes 3b, 3b are inclined downward. The magnet member 3 is fitted into the internal space 8 and the locking holes 7 are fitted into the respective locking pieces 10 by abutting against the surface 10a and forcibly expanding the long inner surface of the housing 2. In this case, the magnet member 3 can be locked to the housing 2 so as not to fall out of the internal space 8.

There are provided four locking means including locking holes 7 and locking pieces 10 so that the magnet member 3 can be securely locked to the housing 2.

At the rear end of the short inner surface of the internal space 8, two pairs of elastic pieces 11, 11 which are inclined forward toward the center of the internal space 8, are integrally formed at predetermined intervals. As described above, when the magnet member 3 is fitted into the internal space 8, the respective elastic pieces 11, 11 are pushed down by the rear end edges of the respective yokes 3b, 3b, and the elastic force generated thereby causes the magnets 3 to move downward. The member 3 is urged to the front side, and the impact force applied to the magnet member 3 can be buffered by repeatedly opening and closing the opening and closing door 1, and the front ends of the yokes 3b, 3b are attracted and sucked. Even when the plate 6 and the plate 6 are not aligned with each other, the elastic pieces 11, 11 are elastically deformed to correct the posture of the magnet member 3, and the yokes 3b,
The front edge of 3b can be entirely sucked to the plate 6 to be sucked to achieve consistency.

Left and right side surfaces 2c, 2d of the housing 2
A wall 12a extending in the longitudinal direction of the housing 2 and a substantially L-shaped frame 12 integrally connected to a tip of the wall 12a.
b, an auxiliary frame 12 having a substantially U-shape in a plan view is protruded, and the auxiliary frame 12 is brought into contact with the surface 1A of the side plate 1a to stably move the housing 2 to the side plate 1a. It can be installed.

The elastic plates 4 and 4 are formed in a substantially L-shaped arm shape, and the base ends thereof are on the left and right side surfaces 2 c and 2 c of the housing 2.
An upper end of the elastic plate 4d is extended from the rear end surface 2b of the housing 2 through the gaps 15 in the auxiliary frame body 12. Engagement projections 16 are integrally provided on both sides. Further, as shown in FIG. 1, each of the elastic plates 4 is attached to the side plate 1a.
The through holes 17, 17 having an interval H1 slightly larger than the width L1 between the engaging projections 16, 16 are formed in opposition to the engaging projections 16, and each elastic hole is formed on the outer periphery of the through hole 17, 17. Recesses 18,1 at intervals H2 slightly wider than width L3 of plates 4,4
As shown by the imaginary line in FIG. 3, the two elastic plates 4 and 4 are gripped to elastically deform the two elastic plates 4 and 4 so that the engaging protrusions 16 and 16 are formed. Through hole 17, 1
7, each elastic plate 4, 4 is elastically returned to the original position only by releasing its elastic deformation.
4 are fitted into the recesses 18, 18, and the engaging projections 16, 16 are engaged with the back surface 1 </ b> B of the side plate 1 a, whereby the magnet catch M can be fixed to the side plate 1 a. ing.

On the other hand, a push-type detection switch 30 is mounted adjacent to and above the housing 2. That is,
A pair of mounting pins 31, 31 extending upward are provided at the housing 2 at predetermined intervals, and a pair of mounting holes 30 </ b> A, 30 through which these mounting pins 31, 31 are inserted.
A penetrates the detection switch 30. Therefore,
By inserting the mounting pins 31, 31 into the mounting holes 30A, 30A, the detection switch 301 can be mounted adjacent to and above the housing 2.

The push-type detection switch 30 is covered by a switch cover 32 in a state where it is mounted above and adjacent to the housing 2. This switch cover 32
Is made of a synthetic resin material such as polypropylene, has a front wall 32B having a window 32A opened on the front side, and guide grooves 32C, 3C.
Side walls 32D, 32D and upper wall 32E forming 2C
Is formed in a rectangular shape having an opening on the rear side and the lower side, and a small rib 32 protruding rearward on the rear surface of the front wall 32B.
F is provided, and a pair of support pins 32G, 32G extending in parallel with a small gap with respect to the inner surface of one side wall 32D protrudes from the inner surface of the upper wall 32E. The size of the window 32A is limited to a size that does not allow a small finger of a person to enter.

The switch cover 32 is mounted adjacently above the housing 2 by the cover mounting means after the push type detection switch 30 is mounted adjacently above the housing 2. The cover mounting means is constituted by a pair of elastic arms 33, 33 continuously extending upward from the left and right side surfaces 2 c, 2 d of the housing 2, and corresponds to the guide grooves 32 C, 32 C of the switch cover 32.
The interval between the opposing surfaces is set to a value substantially equal to the span between the groove bottoms of the guide grooves 32C, 32C, and an engagement portion 34 protruding toward the other side is provided on the inner surface of each of the distal ends. An inclined surface 34a that is inclined in a direction to reduce the facing distance is formed on the distal end side of the engaging portion 34. A hinge lever 35 made of a thin metal plate is mounted inside the switch cover 32. The hinge lever 35 has a substantially L-shape, and a base 35A is formed between the inner surface of one side wall 32D of the switch cover 32 and a pair of support pins 3D.
Inserted into a small gap between 2G and 32G and pinched,
The swinging portion 35B is located on the back side of the front wall 32B and the rib 32F
Is in contact with the window 32A. Note that 36
Indicates a lead wire, and 37 indicates a lead wire lead-out hole.

Therefore, the push type detection switch 3
0 is mounted adjacent to the upper part of the housing 2, and then the switch cover 3 is placed with the guide grooves 32C, 32C of the switch cover 32 corresponding to the pair of elastic arms 33, 33.
2 is pushed between the elastic arms 33, 33, the engaging portions 3
The 4 inclined surfaces 34a abut against the groove bottoms of the guide grooves 32C, 32C to elastically expand the elastic arms 33, 33. Further, by continuing the pushing, the engaging portions 34 are engaged with both ends of the upper wall 32E of the switch cover 32, and the switch cover 32 is firmly attached to the upper side of the housing 2. As a result, the detection switch 30 is covered by the switch cover 32, and the contact 30B of the detection switch 30 is located at the front end position of the stroke (switch open position) behind the swinging portion 35B of the hinge lever 35. Needless to say, the swing part 35B also has the window part 32.
It is held in a state where it does not protrude forward from A (see the solid line in FIG. 7). Further, a pair of elastic arms 33,
By elastically expanding 33, the engagement between the engaging portion 34 and both ends of the lower wall 32E of the switch cover 32 is released, so that the switch cover 32 can be easily removed from the side of the housing 2. This makes it possible to easily remove and inspect the detection switch 30.

On the other hand, as shown in FIGS. 8 and 9, the magnet catch M and the push-type detection switch 30 are attached to the opening 1 of the device by attaching means described later.
Is attached. Adsorbed plates 6, 6 made of magnetic metal are attached to the inner surface of the door 5 corresponding to the magnet catches M, M1. The to-be-attached plate 6 corresponding to the magnet catch M1 is made of a rectangular plate material, and is attached to the inner surface of the door 5 by the same heat welding crimp as the magnet catch M.
The attracted plate 6 corresponding to the magnet catch M is made of a rectangular plate material as shown in FIGS. 9 and 10.
A pair of through holes 6A, 6A are formed (however, FIG.
0 shows only one through hole 6A). Further, a pair of rivet portions 6B, 6B corresponding to the through holes 6A, 6A and a pressing portion 6C are protruded from the inner surface of the resin door 5. Therefore, the rivet portion 6B is inserted through the through holes 6A, 6A, and the tip portion is slightly protruded as shown by the imaginary line, and the protruding portion is thermally welded and caulked as shown by the solid line.
It is attached to the inner surface of. The attracted plate 6 corresponding to the magnet catch M may have a configuration in which a pressing portion 6C is connected to a rectangular plate made of a magnetic metal as shown in FIG. Further, as shown in FIGS. 12 and 13, another plate 6 </ b> D having a pressing portion 6 </ b> C protruding between a rectangular plate made of a magnetic metal and the inner surface of the door 5 may be used. Good.

A pair of positioning projections 19, 19 project from the rear end surface of the housing 2, and the projections 19, 19 are provided.
Is fitted into positioning holes 20a and 20b penetrating through side plate 1a, so that magnet catch M can be attached to a predetermined position on side plate 1a. In addition, one positioning hole 20a is formed in a long hole shape and communicates with the concave portion 18, so that both positioning projections 19, 19
Dimensional errors between them can be absorbed.

A plurality of (two in this embodiment) steps 21 and 22 are formed in the engaging projections 16 and 16 in a stepped manner, and the steps 21 and 22 and the rear end face of the housing 2 are formed. 2b are opposed to the engaging projections 16,1.
6 is gradually expanded from the base end side toward the front end side, and in the case of the thin side plate 1a, as shown by the solid line in FIG. The thin side plate 1a is sandwiched therebetween, and as shown in FIG. 14, in the case of the thick side plate 1b, the thick side plate 1a is sandwiched.
b, recesses 18, 18 having an interval H3 slightly larger than the width L2 between the inner step portions 21, 21 are recessed.
The inner step portions 21 and 21 are fitted in the inner and inner portions 8 and 18, and the outer side step portion 22 and the housing 2 sandwich the thick side plate 1b. Can be securely fixed.

When attaching the magnet catches M, M1 to the opening 1 of the device based on the above-described configuration, the magnet catches M, M1 in which the magnet members 3 are fitted and locked in the housing 2 are prepared, and the housings thereof are provided. By gripping the two elastic plates 4 and 4 projecting from both side surfaces 2c and 2d, the two elastic plates 4 and 4 are elastically deformed, and the front ends thereof are inserted into the through holes 17 and 17 of the side plates 1a and 1b. After insertion, the elastic deformation need only be released. As a result, each of the elastic plates 4 and 4 is elastically returned to the original position, and the engaging projections 16 and 16 protruding from both sides of the distal end portion of each of the elastic plates 4 and 4 are attached to the back surfaces of the side plates 1a and 1b. 1B,
The magnet catches M, M1 can be fixed to the opening 1 of the device.

According to the present invention, as shown by the imaginary line in FIG. 7, by closing the door 5, the attracted plate 6 on the side of the door 5 is attracted to the magnet members 3 of the magnet catches M and M1 to close the door. 5 can be locked. In this case, just before the attracted plate 6 is magnetically attracted to the magnet member 3, the pressing portion 6 is pushed from the window portion 32A of the switch cover 32.
C enters the switch cover 32 and the hinge lever 35
The rocking portion 35B of the is elastically deformed toward the detection switch 30,
Through the elastically deformable swinging portion 35B, the detection switch 3
The zero contact 30B is pressed and urged backward from the stroke front end position to close the detection switch 30 (in some cases, it may be opened). Therefore, the closed state can be detected, and if the power switch (not shown) is already closed, the storage devices can be started by closing the detection switch 30.

On the other hand, when the door 5 is opened for reasons such as an internal inspection, the pressing portion 6C retreats from the window portion 32A of the switch cover 32 as shown by a solid line in FIG.
Of the swing switch 35B elastically returns to the state shown by the solid line, and the contact 30B of the detection switch 30 also returns to the stroke front end position shown by the solid line. That is, even when the contact 30B of the detection switch 30 advances to the front end position of the stroke due to the opening of the door and the detection switch 30 is switched to the open state, not only the contact 30B but also the swing part 3 of the hinge lever 35 is moved.
5B is covered with the window portion 32A of the switch cover 32, that is, the small window 32A limited to a size that does not allow the small finger of a person to enter, so as not to protrude forward. Swing part 3 of hinge lever 35
5B and the contact 30B of the switch 30 can be avoided. As a result, it is possible to reliably prevent the inconvenience that the storage devices are activated against the intention.

In the above embodiment, the magnet catches M, M1 are fixed to the opening 1 of the device on the fixed side, and the attracted plate 6 is provided on the door 5 on the rotating side. The attracted plate 6 may be provided in the opening 1 of the device on the side, and the magnet catches M, M1 may be fixed to the opening and closing door 5 on the rotating side. Further, although the detection switch 30 and the switch cover 32 are mounted adjacent to the upper side of the housing 2, the detection switch 30 and the switch cover 32 may be mounted adjacent to the lower side of the housing 2. Further, the magnet catch M1 not using the push-type detection switch 30 may be omitted, and a pair of magnet catches M including the detection switch 30 may be used.

[0029]

According to the first aspect of the present invention, even if the contact B of the detection switch advances to the front end position of the stroke due to the opening of the door and the detection switch is switched to the open state, the contact remains in the window of the switch cover. Part, that is, the small window, which is limited to the size that a person's little finger cannot enter, is covered in a state that does not protrude forward, so that fingers and tools touch the contact B of the switch when the door is open. Can be avoided. As a result, it is possible to reliably prevent the inconvenience that the storage devices are activated against the intention.

According to the second aspect of the present invention, the switch cover is pushed between the pair of elastic arms in a state where both lateral surfaces of the switch cover correspond to the opposing surfaces of the pair of elastic arms. The switch cover can be firmly attached to the side of. Further, since the engagement between the engagement portion and the switch cover is released by pressing the finger portion to elastically expand the pair of elastic arms, the switch cover can be easily removed from the side of the housing. This makes it possible to easily remove and inspect the detection switch.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an assembled state.

FIG. 3 is a longitudinal sectional view showing a state where a magnet catch is attached to an opening of the device.

FIG. 4 is a view on arrow AA of FIG.

FIG. 5 is a view taken in the direction of arrows BB in FIG. 3;

6 is a view taken in the direction of arrows CC in FIG. 3;

FIG. 7 is a longitudinal sectional view showing an operation state.

FIG. 8 is a perspective view showing an example of a state in which a magnet catch and a plate to be attracted are attached to the copying machine.

FIG. 9 is a perspective view illustrating an example of a suction target plate.

FIG. 10 is a vertical sectional side view of FIG. 9;

FIG. 11 is a perspective view showing another example of the suction target plate.

FIG. 12 is a perspective view showing still another example of the attracted plate.

13 is a vertical sectional side view of FIG.

FIG. 14 is a diagram corresponding to FIG. 3 showing a modification.

FIG. 15 is a configuration diagram of a conventional example.

FIG. 16 is a perspective view showing a state in which a conventional magnet catch and a plate to be attracted are attached to a copying machine.

[Explanation of symbols]

 Reference Signs List 1 opening of device (attached member) 2 housing 3 magnet member 6 attracted plate 30 detection switch 30B contact of detection switch 32 switch cover 32A window 33 elastic arm (cover attaching means) 35 hinge lever (contact of detection switch) Child)

Claims (2)

[Claims] 1. A rectangular frame-shaped housing having a front opening and mounted on the surface of a member to be mounted, and is fitted and held in the housing from the front opening so as to be displaceable in the front-rear direction, and is attracted to the front side thereof. A magnet cover for adsorbing the plate, and a switch cover having a window opening to the front of the housing adjacent to the housing and having a size that does not allow a small finger of a person to enter is mounted by cover mounting means. The switch is mounted on the housing in a state where the switch does not protrude forward from the window portion at the front end position of the stroke, and is attached to the housing. A pressing portion which enters from the window portion and presses the contact element backward from the front end position of the stroke to activate the detection switch. A magnet catch characterized by: 2. The switch cover means extends from both sides of the housing and is opposed to each other, and is engaged with the switch cover when elastically expanded by both lateral surfaces of the switch cover and elastically returned to a natural state. 2. The magnet catch according to claim 1, wherein the magnet catch is constituted by a pair of elastic arms having an engaging portion.