JPH02270231A - Limit switch - Google Patents

Abstract

PURPOSE:To make a limit switch thin and make it possible to set a stroke quantity of an operation lever large by setting the operation lever to be within the thickness of a switch case, and driving an operation plunger by a drive element connected with a base end part of the operation lever through a spring. CONSTITUTION:An operation lever 10 for detecting a subject matter is protruded from a head part 3 within a thickness W of a switch case 1, and it is set to be capable of oscillation in the crossing direction to the thickness, that is right and left. A fixed member 14 fixed at a base end part 10b of the operation lever 10 is connected with an upper part 13a of a drive element 13 through a spring 15. A switch can thus be thin, so a plurality can be connected with each other for use, and the operation lever becomes capable of displacement from a freeness position to exceed an action position shown by a continuous line up to a position shown by dot line, so an action stroke of the operation lever can be large, thereby the subject matter can be securely detected if its motion is large.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a limit switch that detects an object to be detected, such as a workpiece, using an operating lever.

<Prior art and issues> - In the control equipment of JR trains that incorporate limit switches, multiple limit switches are sometimes used in a state where they are connected in the thickness direction. It is desirable that it be as thin as possible. For this reason, conventionally, the thickness of the switch case has been reduced to make it thinner, while the operating lever has been placed in a position where it does not protrude from the external surface of the wound in the thickness direction of the switch case, that is, within the thickness of the switch case. It has been proposed to place it in a position where it can be taken.

By the way, in a conventional limit switch, when an object to be detected hits an operating lever supported on a rotating shaft and the operating lever is rotated by a predetermined angle, a cam or the like fixed to the rotating shaft drives the operating plunger. The push button of the basic switch is pushed in, and there is a limit to how much the stroke of the operating lever can be increased, making it difficult to detect objects that make rough and large movements, for example.

<Purpose of the Invention> The present invention has been made in order to solve the above-mentioned problems of the conventional device. The purpose is

<Configuration and Effects of the Invention> The limit switch according to the present invention includes a switch case incorporating a basic switch, and a switch case that protrudes from the head portion of the switch case and swings in a direction orthogonal to the thickness direction within the thickness of the switch case. an operating lever movably disposed, an operating plunger held movably in the switch case to open and close the basic switch, and a return disposed within the switch case to apply a return force to the operating plunger. a coil spring; and a driver, which is connected to the base end of the operating lever via a spring and is set to be tiltable in the swinging direction, and drives the operating plunger by tilting due to the swinging displacement of the operating lever. It is equipped with the following.

According to this invention, since the operating lever is set within the thickness of the switch case, it is possible to make it thin and connect multiple items in the thickness direction, and in particular, the base end of the operating lever is provided with a spring. Since the operating plunger is driven by a driver connected to the lever, the stroke amount in the swinging direction of the operating lever can be increased by deforming the spring.In other words, even objects with large movements can be detected accurately. There is an effect that can be done.

<Description of Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are a front sectional view and a side sectional view, respectively, showing an example of a limit switch according to the present invention.

In the same figure, l is a thin box-shaped switch case made of synthetic resin, etc., and consists of a case body 2 and a head part 3 fixed to the upper end side of this case body 2, and a lower space of the case body 2. 4 has a built-in basic switch 5 such as a micro switch. 6 is a rubber cover that covers the basic switch 5. In the upper space 7 of the case body 2, an operating plunger 8 having a pushing boss portion 8a vertically disposed corresponding to the push button portion 5a of the basic switch 5 is fitted and held so as to be able to pivot. Reference numeral 9 denotes a return coil spring that is disposed within the space 7 and applies an upward return force to the operating plunger 8.

IO is an operation lever for detecting an object to be detected, and the head portion 3 is
It is set to be able to swing in the direction perpendicular to the thickness direction, that is, in the left-right direction (arrows a and b in FIG. 1). 1) is a roller rotatably mounted on the tip 10a of the operating lever IO with a support shaft 12. Reference numeral 13 denotes a drive element located above the operation plunger 8 and disposed in the upper space 7, and is set to be tiltable in the swinging direction of the operation lever IO. The fixing member 14 fixed to the base end lOb of the operating lever lO and the driver 13
is connected to the upper part 13a by a spring 15. 1
Reference numeral 6 denotes a regulating plate that is fitted into the upper end of the space 7 to regulate the tilting range of the drive element 13.

Next, the operation of the above configuration will be explained.

When the object to be detected hits the roller 1) and the operating lever lO swings, for example, to the right (in the direction of the arrow in Figure 3), the driver 13 is moved in the same direction via the spring 15 as shown in Figure 3. Because of the tilting movement, the operating plunger 8 pivots downward against the spring force of the return coil spring 9, and the operating plunger 8
The push button portion 5a of the basic switch 5 is pushed in by the boss portion 8a, and the switch 5 is turned on. When the object to be detected leaves the roller 1), the operating plunger 8 is returned by the spring force of the return coil spring 9, the driver 13 and the operating lever 10 are also returned to the free position shown in FIG. 1, and the basic switch 5 is also OF
It becomes F.

Here, since the operation lever 10 is disposed within the thickness W of the switch case 1, a plurality of levers can be used in conjunction with each other as it is thin.

In particular, the spring 15 is attached to the base end side of the operating lever lO.
Since the operating lever 10 is connected to the drive element 13 through the lever 10, it is possible to move the operating lever lO from the free position to the position shown by the dashed line in FIG. 3 even beyond the operating position shown by the solid line in FIG. In other words, even if the operating stroke of the operating lever lO is made thicker and the object to be detected moves a lot, the object to be detected can be reliably detected regardless of this.

[Brief explanation of drawings]

1 and 2 are front sectional views showing an example of a limit switch according to the present invention, and FIG. 3 is an explanatory diagram of the operation of the limit switch. l...Switch case, 3...Head part, 5...
Basic switch, 8... Operating plunger, 9... Return coil spring, lO... Operating lever, 13... Driver, 15... Spring, a, b... Rocking direction, W.
··thickness. Agent Patent attorney Kunihiro Zanami (1 other person) '%Ii
',jBFigure 1Figure 2Figure 3

Claims (1)

[Claims] (1) A switch case with a built-in basic switch, an operating lever that protrudes from the head of the switch case within the thickness of the switch case and is swingable in a direction orthogonal to the thickness direction, and the switch An operation plunger is held in a case so as to be able to pivot and open and close the basic switch, a return coil spring is placed in the switch case and applies a return force to the operation plunger, and a spring is attached to the base end of the operation lever. and a drive element connected to the drive element via a drive element configured to be tiltable in the swinging direction, and driving the operating plunger by tilting due to swinging displacement of the operating lever.