JPH06280433A - Magnet device with switch - Google Patents

Abstract

PURPOSE:To make the whole compact and to reduce cost by a method wherein a detecting switch is used and the number of parts and the number of assembling processes are reduced. CONSTITUTION:A pair of yokes 4A and 4B are arranged in an inserted state on both sides in the direction of width of a body case 1 in a state to be securely engaged with the body case 1. A permanent magnet 7 and a switch case 8 are mutually linearly arranged and contained in a state to be nipped between a pair of the yokes 4A and 4B. A push type detecting switch 9 is contained in the switch case 8 in a state that an actuator 10 thereof is protruding forward by a necessary operation stroke.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function as a magnetic catch for adsorbing and holding doors of various equipment storage cases, cabinets, furniture, etc. in a closed state by the magnetic force of a permanent magnet. The present invention relates to a magnet device with a switch that also has a function of detecting opening / closing.

[0002]

2. Description of the Related Art As a magnet device with a switch of this type, one having a structure as disclosed in Japanese Utility Model Laid-Open No. 2-118075 is conventionally known. The structure of the lock with a switch for doors disclosed in the publication will be briefly described with reference to FIGS. 5 and 6. 5 is an exploded perspective view of the constituent members, and FIG. 6 is a front view of the assembled state. In each of these drawings, 20 is a main body case, and a rectangular opening 22 is formed on the side of the mounting seat 21. An approximately H-shaped slit hole 23 is formed in the one side plate portion in the width direction. Reference numerals 24A and 24B are a pair of yokes, which are corrugated plates interposed between the lower side portions of the pair of yokes and the other side plate portion in the width direction of the body case 20 when inserted into the body case 20 through the opening 22. Due to the elastic force of the spring 25, the upper side portions 24 a and 24 b are housed so as to be slightly exposed from the main body case 20 through the slit hole 23.

Reference numeral 26 denotes a permanent magnet, which is housed in the main body case 20 by being sandwiched between the pair of yokes 24A and 24B at one end side in the longitudinal direction of the opening 22. 27
Is a micro switch, which is arranged on the side of the permanent magnet 26, and the contact 29 at the tip of the hinge lever type actuator 28 is passed through the center of the slit hole 23 from the upper side 24a, 24b of the yoke 24A, 24B. Is also fixedly held in the main body case 20 together with one of the yokes 24A via the mounting screw 31 in a state in which the lead wire 30 is protruded forward by the required operation stroke and the lead wire 30 is led out to the rear side of the main body case 20. Reference numeral 32 denotes a back cover, which is adhered and fixed to the main body case 20 so as to close the opening 22 of the main body case 20 in a state where the above-described respective components are housed in the main body case 20.

[0004]

In the conventional magnet device with a switch having the above-described structure, since the microswitch 27 is used, the entire outer shape of the width, height and length of the entire device is obtained. The dimensions tend to be relatively large. Also,
In addition to the large number of parts, at least two screws 31 need to be tightened to attach the microswitch 27, and an adhesive work is required to attach the back cover 32. Therefore, the assemblability is poor and the manufacturing cost is low. In terms of aspects, it still has many improvements.

The present invention has been made in view of the above circumstances, and uses a push-type detection switch which is not inferior to a micro switch in terms of performance to achieve overall compactness and the number of parts. Another object of the present invention is to provide a magnet device with a switch that can be constructed at low cost by reducing the number of assembling steps.

[0006]

In order to achieve the above object, a magnet device with a switch according to the present invention is provided with engaging projections on both inner surfaces in the width direction of a main body case which opens only in one direction. A pair of yokes having engaged parts that engage with the engaging projections are inserted and arranged in the main body case through the above-mentioned openings with their front end sides exposed slightly forward from the main body case. In addition, the permanent magnet and the switch case, which are linearly arranged to each other, are housed in a state of being sandwiched by the pair of yokes,
A push type detection switch is housed in the switch case in a state in which the actuator thereof protrudes forward by a necessary operation stroke from the front end side portion of the yoke.

[0007]

According to the present invention, as a switch for detecting opening and closing of doors, it is not only excellent in mechanical and electrical life characteristics as compared with a micro switch, but also a very light and small push type switch. By using the detection switch of (1), the required external dimensions of the main body case can be reduced, and the entire device can be made compact. Further, by adopting an engaging structure for fixing the main body case and the pair of yokes, and adopting a fixing structure for sandwiching the permanent magnet and the detection switch between the pair of yokes, the number of parts is reduced and the screw By eliminating troublesome work such as tightening and adhering, the number of assembling steps can be reduced and the cost of the entire apparatus can be reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of constituent members of a magnet device with a switch according to an embodiment of the present invention, FIG. 2 is a vertical sectional front view of an assembled state, and FIG. 3 is a plan view of the same.

1 to 3, 1 is a main body case,
An opening 2 having a substantially rectangular shape is formed on the front surface thereof, and one side plate portion at a right angle to the opening 2 is continuously provided with a mounting seat portion 3 projecting to both sides. The case 1 is integrally molded from a resin such as polypropylene. Reference numerals 4A and 4B denote a pair of yokes, and engaged holes that engage with the engagement protrusions 5 and 5 provided on the inner surfaces of both side plate portions in the width direction of the main body case 1 are formed at the central portions in the longitudinal direction thereof. 6A and 6B are formed, and the engaged holes 6A and 6B are engaged with the engaging protrusions 5 and 5 of the body case 1, respectively, and the front end sides 4a and 4b are formed into the body case. 1, the pair of yokes 4A and 4B are passed through the opening 2 and the main body case 1
It is inserted and arranged on both sides in the width direction.

Reference numeral 7 denotes a permanent magnet, and the permanent magnet 7 is provided with claw portions 4a3, 4 which are projected from both ends of the pair of yokes 4A, 4B in the width direction toward opposite sides.
It is housed in the main body case 1 with both magnetic pole surfaces sandwiched and fixed by a3, 4b3 and 4b3. Reference numeral 8 denotes a switch case formed of a resin such as polypropylene, which is linearly arranged on the lateral side of the permanent magnet 7 and, like the permanent magnet 7, has yokes 4A and 4B.
Protrusions 8a, 8a formed on both side surfaces of the switch case 8 in small holes 4a2, 4b2 opened opposite to each other.
(Only one side 8a is shown), and both yokes 4A, 4 are inserted.
The switch case 8 is sandwiched and fixed at B, and is housed in the main body case 1. 9 is the switch case 8
The push-button type actuator 10 is a push-type detection switch housed in a retaining manner inside, and the push-button actuator 10 of the detection switch 9 has an exposed front end side portion 4a of the yokes 4A and 4B.
The required operation stroke S is projected forward from 4b. Further, the lead wire 11 of the detection switch 9 penetrates through the switch case 8 and the bottom plate portion of the main body case 1 and is led out to the outside.

The magnet device with a switch having the above structure is
For example, as shown in FIG. 4, the exposed front end sides 4a and 4b of the yokes 4A and 4B and the detection switch 9 are provided on the free end side of the opening / closing door B near the opening C of the storage item A such as a cabinet or furniture. The actuator 10 is attached so as to face the opening C. When the opening / closing door B is closed, it functions as a magnetic catch that attracts and holds the door B in the closed state by the magnetic force of the permanent magnet 8, and operates the actuator 10 in accordance with the opening / closing operation of the door B to detect the magnetic field. The opening / closing of the door B is detected by the switch 9, and the lighting device D provided in the storage item A such as a cabinet or furniture is automatically turned on / off or a buzzer is automatically sounded by the detection signal. It is used to exert its function.

In the above embodiment, the detection switch 9 is arranged at one end of the permanent magnet 7, but the permanent magnet 7 is divided into two and the detection is performed between the two permanent magnets. The switch 9 may be arranged.

[0013]

As described above, according to the present invention, as a switch for detecting the opening and closing of doors, not only is it superior in mechanical and electrical life characteristics as compared with a micro switch, By using a very light and small push type detection switch, it is possible to reduce the necessary external dimensions of the main body case and to make the entire device compact. Further, by adopting an engagement structure for fixing the main body case and the pair of yokes and adopting a fixing structure for sandwiching the permanent magnet and the detection switch between the pair of yokes, the number of parts can be reduced. At the same time, labor-intensive work such as screw tightening and bonding can be eliminated, and the number of assembling steps can be reduced. Therefore, the cost reduction of the entire device can be achieved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of constituent members in a magnet device with a switch according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of an assembled state in the embodiment.

FIG. 3 is a plan view of an assembled state in the example.

FIG. 4 is a schematic plan view illustrating a usage state.

FIG. 5 is an exploded perspective view of constituent members in a conventional magnet device with a switch.

FIG. 6 is a front view of FIG.

[Explanation of symbols]

 1 Main Body Case 2 Openings 4A, 4B Yokes 4a, 4b Exposed Front End Side 5 Engagement Protrusions 6A, 6B Engagement Part 7 Permanent Magnet 8 Switch Case 9 Push Type Detection Switch 10 Actuator

Claims (1)

[Claims] 1. A pair of yokes having engaging projections provided on both inner side surfaces in the width direction of a main body case that opens only in one direction and engaging with these engaging projections, and a front end side thereof. The permanent magnet and the switch case which are linearly arranged between the pair of yokes are sandwiched between the pair of yokes and are inserted into the body case through the opening so that the parts are exposed slightly forward from the body case. With a switch, the push type detection switch is housed in the switch case such that the actuator protrudes forward by a necessary operation stroke from the front end side of the yoke. Magnet device.