JPS6269412A - Adjustable microswitch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to improvements in microswitches used for electrical control of various mechanical devices.

(Conventional Branch Techniques) Today, microswitches are extremely widely used for electrical control of various mechanical devices, and it is well known that there are many types of microswitches (for example, Tateishi, It
Machine Co., Ltd. Control Equipment! Published by 19 Business Headquarters Sales PR Center [
(See "Best Control Equipment OMROM 6th Edition").

However, all existing microswitches have a structure in which a lever inside the box-shaped body is operated.
It is difficult to downsize beyond a certain level (the standard size is about 50m+s long axis, and the so-called Jfl compact is about 13a+m long axis), and the structure requires a considerable amount of play, so the operating point must be precisely determined. 21 to 21! It is difficult to adjust. Of course, as stated on page 42 of the catalog above,
There are also so-called "adjustable" types, but they are quite expensive.

Therefore, it is often difficult to install these existing switches in narrow spaces such as between machine frames. Moreover, ``frivolous, short, and small'' is the trend of the times.

(Purpose of the invention) In view of the above circumstances, the present invention is small in size.

To provide a novel adjustable microswitch whose operating point can be precisely adjusted and which can be installed anywhere where a screw hole for insertion can be drilled.

(Means for Accomplishing the First Achievement) In order to achieve the above object, the present invention makes the microswitch itself rod-shaped, has a male screw groove carved on its outer periphery, and has a contact point inside the rod-shaped body. Adopts a configuration with built-in. According to the present invention, a male thread groove is carved on the outer periphery of a cylindrical casing containing a contact element urged by a return spring at the tip, and a contact is built in the casing. Adjustable
Requires microswitch.

- In a general configuration, the switch of the present invention is:

A cylindrical casing with a male screw for mounting and fine adjustment around the casing, a contact (probe) freely inserted into the front part of the casing, and if necessary, the displacement of the contact can be adjusted to the rear. a relay member for transmitting the signal to the conductive member; a conductive member attached to the rear of the relay member; and a return spring that constantly urges the relay member and the contact including the conductive member toward the original position l. , the main components include the conductive member and a pair of terminal members facing each other.

In each of the above elements, in order to widen the adjustable distance range as much as possible, it is preferable that the casing has a male thread carved over its entire length, and more preferably, a tightening means using a nut is added. is allowed.

The contact may have virtually any shape as long as it can accurately sense the pressing action of the driver and transmit it to the rear conductive member. For example, a bottle, a ball, a roller, etc. All the contacts used in known microswitches can be used in the same way, but in the type of the present invention in which the linear interlocking of the contacts is directly transmitted to the conductive member, a pin with no play in the bearing is used. Alternatively, a ball, especially a ball that can easily cope with rotational contact or diagonal contact of the driving body, is optimal. However, if a ball is used as the contact, it is difficult to directly transmit the displacement to the conductive member. Therefore, a non-conductive relay member is interposed between the ball and the guide member, and the conductor member is attached to this relay member. In practice, this relay member can be made as a cylindrical body that can fit snugly into the inner surface of the casing, and care should be taken to prevent dust, oil droplets, etc. from entering the inside from the contact side. Furthermore, the material used is low-thickness engineering resin such as polyacetal resin or polyamide resin! Beautiful,
This element is always urged along the axial direction toward the contact by a spring. The conductive member is made of a conductive material such as brass or phosphor bronze, and preferably has its surface plated with a non-oxidizing noble metal such as silver, gold or platinum.

It is made into a cylindrical shape with a diameter smaller than that of the above-mentioned relay member, and is integrally fitted into the latter.

It is preferable that the pair of contact members is embedded in a non-conductive support body in order to maintain the strength of the contact member, which is opposed to the contact surface of the latter with a small gap from the upper conductive member. ,
More preferably, the support itself is also designed to be buffered with springs to absorb excessive pressing force against the conductive member. In this case, the support member is made of the same material as the relay member and is configured to be able to slide along the inner wall of the casing. The rear end of this contact member is desirably designed to be closed with a cover that can be opened and closed, if necessary, to prevent dust, oil, etc. from entering the inside.

(Function) The switch of the present invention can be easily miniaturized to an outer diameter of 10 mm or less, and due to its structure, undesirable foreign substances such as dust (for example, metal powder), machine oil, etc. can enter the interior. Moreover, since the entire structure is screw-shaped, it can be attached directly to the machine frame, panel, or anywhere else where screws can be cut. Then, by retracting the whole using a screw, it is possible to make fine adjustments of 100 fields or less along the screw axis direction.

Furthermore, by adopting a method in which the contact member is buffered by a spring, which is a preferred embodiment of the invention, even if an excessive pressing force is applied to the contact, deformation and wear of one member can be suppressed, so that the switch can operate smoothly. The number of times can be increased significantly.

(Example) Examples of embodiments of the invention will be disclosed below with reference to the accompanying drawings, but these examples are, of course, for illustrative purposes only.

It does not directly define the connotation and extension of the inventive idea.

Now, FIG. 1 is a longitudinal sectional view along the screw axis direction of an example of a microswitch according to the present invention, and FIG. 2 is an exploded perspective view thereof.

[Structure] The switch (1) of this example has a cylindrical casing (0) with a truncated conical tip and a circular space (10) inside the casing that is arranged from the front to the rear. The ball-shaped contact (2), the polyacetal cylindrical medium tm member (2) behind said 3, and the rear surface of said member (4) were in front of me.A smaller diameter, cylindrical conductive member (4°) , a return spring (12) fitted around the member (4°) and engaged by the rear surface of the member 0 and the terrace (2b) inside the casing (0);
A cylindrical flanged terminal holding member CD facing the rear surface of (4°) with a slight gap, a pair of terminals (5, 5) inserted and fixed inside the member ((4), and a 1m member The space (1
0c) and a shock absorbing spring (2) inserted into the body as an essential component.

The L casing ■ has a male thread (2a
) can be engraved and fixed to the support with a nut (■). Further, the terminal member (■) has a flange (eb) on its rear edge,
By engaging the flange with the rear terrace (2c) inside the casing, it is held in the position shown in Figure 1 in the non-operating state.The tip of the terminal (5a
), and its ends form a terminal plate (5b), to which each terminal of the lead wire CI+) is fixed. A male thread (8a) is carved into the peripheral edge of the rear end lid member (■), and the screw is inserted into the acid thread groove (1) carved into the inner surface of the rear end of the casing (■).
The lid member (■) of 0, l: which is screwed together with the protrusion (
8b), and a cap (13) made of urethane rubber fits into the protrusion.

In this example, if necessary, the terminal board (5a) may be changed to a rotary contact.This will make the structure somewhat more complicated, but if you do this, the terminal of the lead wire is already wired. Even if the wire is twisted, the twist in the wire can be eliminated.

[Operation 1] Attach the microswitch of this example to a screw hole carved in a machine frame, panel, or other arbitrary support using the male screw groove (2a), and attach the tip of the contact After adjustment, use nut (2) to fix at a predetermined position δ.

Next, when the contact ■ is suppressed, its displacement is caused by the relay member @
) is directly transmitted to the conductive member (4°), so that the member (4°) contacts the terminal (2). At this time, if the displacement til becomes an issue for some reason, use the spring Q)
Since the contact point (5a) is compressed and absorbs the impact, there is no wear and tear on the contact point (5a).

(Effects) As explained above, the present invention is compact, as described in the "Purpose" section above, allows for precise adjustment of the motion α, and also requires no screw holes for insertion. It is possible to provide a new adjustable microswitch that can be installed anywhere where electrical control is possible, thus contributing to all industrial and chemical technology fields that require electrical control.

[Brief explanation of drawings]

FIG. 1 is a sectional view along the screw axis direction of an example of the microsinch according to the present invention, FIG. 2 is an exploded perspective view thereof, and FIG.
The figure is an exploded perspective view of a known adjustable micro-sinch. A brief explanation of the drawing is as below: :L ball-shaped contact f, 4:1 relay member, 4゛:
1 conductive member, 5: entire terminal L, 6: end T holding member,
7: Buffer spring, 8:1 lid member, 9:1 tightening nut, 10:2 internal space, 11: Lead wire,
Patent Applicant: Maei Seisakusho Co., Ltd. Agent: Patent Attorney Kiyoshi Toburawaki-1+,”': Zo, Doro 8 Goji 1m

Claims (4)

[Claims] (1) A cylindrical casing with a built-in contact urged by a return spring at its tip has a male thread groove carved on the outer periphery, and a contact is built into the casing. Adjustable micro switch. (2) Claim 1, wherein the contact is supported by a spring in a floating manner opposite to the direction of movement of the contact, and is configured such that excessive displacement of the contact causes contraction of the spring. The switch mentioned. (3) The switch according to claim 1, wherein the casing has a length sufficient to cover a desired adjustment range and is configured to be fixed to the support member with a nut. (4) The switch according to claim 1 or 2, wherein the contactor is a ball.