JPH0290420A - Microswitch - Google Patents

Abstract

PURPOSE:To make a contact portion, etc., free from damage by linearly arranging a movable contact of a movable agent pushed by an operating agent through a spring and a fixed contact coming into contact therewith in the cylindrical direction of a cylinder. CONSTITUTION:At the time of non-working, a material to be detected does not abut to the tip of the plunger shaft 19 of a plunger 16, and the plunger 16 is in such a state that it is not pushed in. In that state, a movable 21 is in such a state that the lower circumferential edge of it movable plate 22 engages with just the top of an engaging projection 15 of a holding plate 14, so that a space is kept between the movable agent 21 and the surface of a projection 10 of a bottom cylinder member 2 of the movable agent 21 so that a movable contact 26 is separated from a fixed contact 13. When the material to be detected abuts to the tip of the plunger shaft 19 and the plunger 16 is pushed in, a round base 18 of the plunger 16 pushes in the upper end of the first coil spring 17, and then, a pushing force works on the movable agent 21, too, but the movable agent 21 does not descend because the lower circumferential edge of the movable plate 22 is engaged to the top of the engaging projection 15 of the holding plate 14. Further, when the plunger 16 is pushed in, the spring 17 is in a compressed condition, and the lower end of a cylinder section 20 abuts to the upper end of a projected stripe 23 of the movable agent 21 so that the spring 17 pushes directly the upper end of the projected stripe 23.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to improvements in microswitches used for detecting conveyed articles in factory production lines and the like.

(Prior art and its problems) The configuration of a conventional microswitch will be explained with reference to the configuration diagram of FIG.

In the figure, reference numeral 100 is a resin casing on the main body side, and a block portion 101 is provided so as to protrude from the lower half side, and three fitting grooves 102 provided on the surface of the block portion 101 are provided. One movable contact terminal fitting +03 and two fixed contact terminal fittings 104 are fitted to each other.

A switch actuation space 106 surrounded by the block part 101 and a rising wall part 105 is recessed above the block part 101 of the resin casing 100.
The above-mentioned terminal fitting 10 is placed in this switch operation space 106.
A movable piece 108 is arranged on the upper side of each of the terminal fittings 104 and the upper side of the terminal fitting 103 via a spring plate 107, and a fixed piece attached to the upper end of both terminal fittings 104 is arranged. Each of the contacts 109 is connected to the movable piece 10
8 are located opposite to each other via a movable contact 110 attached to the end of the terminal.

Reference numeral 112 denotes a push button, which is installed in an opening 113 provided in the rising wall portion I05, with its upper side protruding upward from the opening 113, and its lower side positioned on the movable piece +08. . As described above, with each member attached to the resin casing 100 on the main body side, the resin casing on the cover side (not shown) is integrally attached from the front side to form a microswitch. .

When the push button 112 is not pushed in, the movable piece 108 is biased upward by the spring force of the leaf spring 107, causing the movable contact 110 to close to the fixed contact 109.
contact with. On the other hand, when the push button 112 is pressed, the movable piece +08 is pressed by the push button 112.
is displaced together with the leaf spring 107 against the urging force of the leaf spring 107, and then, when the direction of the urging force of the leaf spring 107 is reversed, it is further displaced downward by the reversed biasing force,
The movable contact 110 is configured to contact the fixed contact 109 below.

However, in the case of the microswitch having the above configuration, since the central part of the movable piece 108 is pressed by the pushbutton 112, the pushbutton +112 of the microswitch is pressed.
The maximum length of the exposed surface of the movable piece 10 is at least
There was a problem in use that the length was 8 or more, and it could not be used in an installation location where the length could not be secured.

In addition, since the leaf spring 107 that displaces the movable piece +08 is of a very small shape, the push button 112 described in "2" is pressed, the leaf spring 107 is displaced, and the direction of the biasing force is reversed. The operation process cannot take a long time, and this operation process is performed using the push button 112 that displaces the movable piece 108.
As a result, a long stroke cannot be obtained, and there is still a problem in that it is subject to limitations in use.

(Object of the Invention) The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a microswitch that is compact in shape, has a large stroke of its actuating body, and is convenient to use. shall be.

(Configuration and Effects of the Invention) In order to achieve such an object, the present invention provides a microswitch that includes a cylindrical body with a bottom, a fixed contact provided on the upper surface of the bottom of the cylindrical body, and a space inside the cylinder. a movable body that is movable in the cylindrical direction and has a movable contact on a side opposite to the fixed contact; a spring that is provided in the space within the cylinder and elastically holds the movable body; It is inserted through an opening provided on the opposite side to the side where the bottom of the cylindrical body is located, and the other end side protrudes from the cylindrical body through the opening through the opening, and is displaced and moved when the other end side is pressed. The movable body is pressed on the one end side of the movable body to bring the movable contact into contact with the fixed contact.

According to this configuration, the actuating body, the movable body pressed by the actuating body, and the fixed contact with which the movable contact of the movable body comes into contact are arranged linearly along the cylindrical direction of the cylindrical body, so the micro switch The planar shape of the surface where the actuating body protrudes from the cylindrical body is not larger than the outer circumferential planar shape of the cylindrical body, and the planar shape is compact, so it can be used without being restricted by the place of use. Ta.

In addition, the stroke of the actuating body can be made large in the length direction of the cylinder without using a leaf spring as in the conventional case. Now you can use it without receiving any damage.

(Description of Examples) A microswitch according to an example of the present invention will be described in detail based on the drawings. FIG. 1 is an internal transparent perspective view of the microswitch, FIG. 2 is an exploded perspective view, and FIG. 3 is a cross-sectional view.

In these figures, reference numeral 1 is a cylinder body, 2 is a cylinder bottom member, the cylinder body l is a resin molded product, and has an upper surface part 5 provided in the center with a protruding opening 4 for an actuating body, which will be described later; A pair of notches 6 are provided at opposing positions on the lower edge, and a peripheral surface portion 7 is integrally formed with a pair of concave portions 8 provided on the inner surface in the cylindrical direction.

The cylindrical bottom member 2 is a resin molded product, and has a circular protrusion 10 integrally provided in the center of two sides of a circular plate 9. Each of 11 is a fixed terminal fitting, and the circular plate 9
The fixed terminal fittings 1 are inserted into the lower surface, and the portions of the fixed terminal fittings 1 that protrude from the lower surface of the lower circular plate 9 serve as terminals. The part is the fixed contact 13. Further, from the opposing positions of the upper surface periphery of the circular plate 9, each of the holding parts 14 of the movable body, which will be described later, protrudes into two parts and is integrally provided, and the opposing surfaces of each of the holding parts I4 are integrally provided. Each of the engaging protrusions 15 is integrally provided on the side.

Then, in a state in which each of the holding parts 14 of the cylinder bottom member 2 is fitted into each of the notches 6 of the cylinder body l, the lower surface of the peripheral surface part 7 is applied to the peripheral part of the upper surface of the circular plate 9 with an adhesive or the like. The cylinder body 1 and the cylinder bottom member 2 are fixed together to form a bottomed cylinder 3.

16 is a plunger as an actuating body; 17 is a first coil spring attached to the plunger 16; The plunger 16 is a resin molded product, and includes a circular base 18 and a plunger shaft 1 protruding from the center of the upper surface of the circular base 18.
9, a cylindrical portion 20 protruding from the lower surface of the circular base 18,
It consists of a pair of guide protrusions 29 that protrude laterally from the side of the circular base I8. Then, in a state in which the plunger shaft 19 protrudes outward from the protruding opening 4 of the upper surface portion 5 of the cylinder body 1, each guide convex portion 29 is fitted into each of the grooves 8 of the peripheral surface portion 7 of the cylinder body l. At the same time, the upper part of the first coil spring 17 is fitted into the cylindrical part 20 on the lower surface of the circular base I8, so that the plunger 16 and the first coil spring 1
7 is installed inside the cylinder body l.

Reference numeral 21 denotes a movable body, which is made of a resin molded product, and has annular protrusions 23 and 24 integrally provided on both sides of a circular movable plate 22, and an engaging piece 25 that can be inserted from opposing positions on both sides. A circular plate spring is cut into a predetermined shape and deformed at a position surrounded by the convex strip 24 on the lower surface of the movable plate 22. A movable contact 26 is attached.

This movable body 21 has a cylinder in which the first coil spring 17 is fitted into the protruding line 23 on the upper surface, and each of the engaging pieces 25 is fitted into each grooved line 8 on the peripheral surface part 7 of the cylinder body 1. It is provided within the main body l.

27 is a second coil spring, whose upper end is connected to the protrusion 24 on the lower surface of the movable body 21, and whose lower end is connected to the protrusion 14 of the cylindrical bottom member 2.
They are provided at a position within the joint between the cylinder body l and the cylinder bottom member 2 so as to fit therein, respectively. As mentioned above, the plunger 16, the first coil spring 17, the movable body 21, and the second coil spring 27 are installed in a straight line from the second part in the space inside the cylinder l,
The plunger 16 is biased upward by the first coil spring 17, and the movable body 21 is biased by the first and second coil springs 17, 27 in opposite directions toward the bottom stop. Both are provided so as to be movable in the cylindrical direction within the cylindrical body I using grooves 8 as guides.

Next, the operation will be explained.

Both FIGS. 1 and 3 show a state in which the plunger 16 is not in operation, that is, the object to be detected does not come into contact with the tip of the plunger shaft 19 of the plunger 16, and the plunger 16 is not pushed in.

In this state, the movable body 21 is in a state in which the lower peripheral edge of the movable plate 22 just engages with the upper part of the engagement protrusion 15 of the holding part 14, and therefore, the movable body 21 and the protrusion of the bottom cylinder member 2 A space is maintained between the movable contact 26 and the fixed contact 13, and the movable contact 26 and the fixed contact 13 are separated from each other.

On the other hand, when the object to be detected comes into contact with the tip of the plunger shaft 19 and the plunger I6 is pushed in, the circular base 18 of the plunger 16 pushes the upper end of the first coil spring 17. At this time, the movable body 2
A pressing force also acts on I, but as described above, the lower peripheral edge of the movable plate 22 of the movable body 21 is engaged with the upper part of the engagement convex portion 15 of the holding portion 14, so that the movable body 21 does not descend. Then, when the plunger 16 is pushed further, the first coil spring 1
7 is compressed, the cylindrical portion 2 of the plunger 16
The lower end of the movable body 21 comes into contact with the upper end of the convex strip 23 and presses it directly with a large force.

In this manner, when a large pressing force is applied to the movable body 21, each of the engagement convex portions 15 of the holding portion 14 elastically expands outward on both sides. When the movable body 21 passes over the top of the engagement convex portion 15, the movable body 21 descends all at once due to the elasticity of the engagement convex portion 15. It is stopped in a state where it is in contact with the upper surface of the protrusion 10,
In this state, as shown in FIG.
contacts each of the fixed contacts I3 elastically.

This contact causes each of the fixed contacts I3 to connect to the movable contact 26.
, and a detection signal is output from the terminal of the fixed terminal fitting 11 . In this state, since the movable body 21 passes through the position of the engagement convex portion 15, the holding portion 14 has returned to its original position due to its elasticity.

2, the movable body 21 descends at a high speed due to the elasticity of the engagement protrusion 15, and the movable contact 26 moves to the fixed contact 13.
Since the contact points are in contact with each other, there is less arcing generated when the contacts are in close proximity, thereby avoiding damage to the contact portions, etc.

Furthermore, the contact between the fixed contact 13 and the movable contact 26 is as follows:
Since the lower end of the protrusion 24 on the lower surface of the movable body 21 is in contact with the upper surface of the protrusion 10 of the bottom cylinder member 2, the detection signal is stabilized and the contact pressure is increased. Since the generation of arcs due to fluctuations is avoided, damage to the contact portions etc. is also avoided by this.

Next, when the object to be detected moves away from the plunger shaft I9 and the pushing force no longer acts on the plunger 16 and rises, no pushing force acts on the movable body 2I, so it can be moved by the biasing force of the second coil spring 27. The body 21 is pushed up, and the movable body 21 rises all at once due to the elasticity of the engagement protrusion 15 at a position beyond the top of the engagement protrusion 15 and returns to its original position, and the movable contact 26 and the fixed contact I3 are also separated. The detection signal from the terminal is also stopped.

Also in the second operation, the movable body 21 rises all at once and the movable contact 26 and the fixed contact 13 are separated, so there is still little arcing.

[Brief explanation of the drawing]

Figures 1 to 3 relate to embodiments of the present invention, in which Figure 1 is an internal perspective view of the microswitch, Figure 2 is an exploded perspective view, Figure 3 is a cross-sectional view, and Figure 4 is an exploded perspective view of the microswitch. It is a sectional view showing an operating state. FIG. 5 is a configuration diagram of a conventional example. 3 Cylindrical body, 4... Projection opening, I3... Fixed contact, 16... Plunger (operating body), 17... First coil spring (spring), 21... Movable body, 26... - Movable contact, 27... Second coil spring (spring). Ward Otsu Ward I

Claims (1)

[Claims] (1) A cylindrical body with a bottom, a fixed contact provided on the upper surface of the bottom of the cylindrical body, and a movable contact provided movably in the cylindrical direction in the internal space of the cylindrical body and facing the fixed contact. a movable body provided in the cylindrical interior space and elastically holding the movable body; one end side of the cylindrical body inserted through an opening provided on a side opposite to the bottom of the cylindrical body; The other end protrudes from the cylindrical body through the opening to the outside, and when the other end is pressed, the movable body is pressed at the one end, and the movable contact is brought into contact with the fixed contact. A microswitch consisting of a body.