JPH0235139Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an enclosed limit switch in which a plunger type head and a lever type head can be interchangeably attached to the same housing.

Conventionally, in this type of enclosed limit switch, the spring that returns the plunger is different for the plunger type and the lever type, and when springs with the same elasticity are used, the return force of the lever type plunger is weaker than that of the plunger type. Become. This is because the lever type, for example the roller lever type, requires a rotating shaft to move the plunger in addition to the plunger, so the plunger type and lever type can be interchanged in one switch housing. Due to their structure, it is impossible to install them properly, and for maintenance it is necessary to prepare independent products with different structures, and there are also problems in inventory management.

This invention is an attempt to eliminate such conventional drawbacks, and one embodiment of this invention will be described below with reference to the drawings.

That is, in FIG. 1, a switch 2, such as a snap-acting switch, is accommodated in a housing 1. Further, a fitting hole 3 is provided at one end of the housing 1 along its axis, and a diaphragm seal 4 is fitted into the bottom of this hole. Furthermore, on this seal, the fitting hole 3
An operating rod assembly 5 is housed inside. This operating rod assembly is constructed as follows. That is, an operating rod 8 for pressing the plunger 7 of the switch 2 via the diaphragm seal 4 is slidably inserted into the guide 6, and a slider 9 is slidably guided on the operating rod. In addition, this slider is prevented from coming off by a stopper 10 provided at one end of the operating rod 8. Also, the guide 6 and slider 9
A return spring 15 is provided between the slider 9 and the operating rod 8, and a receiving piece 16 is provided between the slider 9 and the operating rod 8.
There is a spring 17 for overtravel between
is provided. The operating rod assembly 5 having such a configuration is fitted into the fitting hole 3 in a previously sub-assembled state.

Further, as shown in FIGS. 2 to 4, a head 20 is detachably attached to one end of the housing 1 with screws 21, 21. A guide tube 23 for slidably guiding the plunger 22 is provided on this head so as to extend outward along its axis and at both ends thereof. Therefore, this guide tube is removably fitted into the fitting hole 3.
Further, a stopper 24 is fixed to the other end of the plunger 22 to restrict its movement toward one end within a predetermined range. The plunger 22 is provided with a stepped portion 25 that comes into contact with the slider 9. Therefore, the plunger 22 can be operated with the head 20 attached to the housing 1, that is, with the guide tube 23 fitted into the fitting hole 3. The rod 8 is inserted into the plunger 22,
At the same time, the stepped portion 25 receives the outer peripheral edge of the slider.

5 and 6 show a lever type switch such as a lever or a roller lever, and the head 20 has a rotating shaft 30 having an axis intersecting the plunger 22 at one end thereof. The plunger 2 is rotatably supported, and the plunger 2 is supported at its notch 31.
Operate 2. The outer diameter of the guide tube 23 is set to be the same as that of the plunger type shown in FIG. However, the difference from the plunger type head configuration is that an auxiliary spring 33 is provided between the plunger 22 and a receiving piece 32 provided at the other end of the guide tube 23, which always biases the plunger upward in the figure. There is. That is, this lever-type head is compatible with the plunger-type head shown in FIG. 4, and therefore both can be selectively attached to the same housing.
And it can be installed removably.

Therefore, when the head 20 shown in FIG. 6 is attached to the housing 1 (FIG. 5), the plunger 22 and the rotating shaft 30 are returned to their original positions by the sum of the forces of the return spring 15 and the auxiliary spring 33.

As mentioned above, this device accommodates the switch 2 in the housing 1, and also provides an operating rod 8 at one end of the housing for pressing and operating the switch 2, and the operating rod 8 is always placed between the operating rod and the housing 1. Return spring 1 biased toward one end thereof
5, and a plunger type head or a lever type head supporting the rotating shaft 30 is selectively and removably attached to one end of the housing 1, and a fitting provided at one end of the housing 1 is attached to these heads. A guide cylinder 23 of the same outer diameter is provided in a protruding manner to be compatible and removably fitted into the matching hole 3, and the operation of the rotating shaft 30 is controlled by the operating rod 8 inside the guide cylinder of the lever type head. A plunger 2 is provided between the plunger 22 and the head 20 that transmits the information.
2 is provided with an auxiliary spring 33 that always biases it in one direction, it is possible to have compatibility between the plunger type head and the lever type head, and moreover, the lever type head can be attached to the housing 1. Sufficient restoring force can be obtained even in this state. Furthermore, since the outer diameter of the guide tube 23 is the same for both the plunger type and the lever type, the housing 1 can be used in common, which has the advantage of facilitating inventory management.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of the housing of the enclosed limit switch of this invention with the head removed, Fig. 2 is a front sectional view showing the plunger type head attached to the housing, and Fig. 3 is a side sectional view. 4 is a front sectional view of the head, FIG. 5 is a side sectional view of the lever type head attached to the housing, and FIG. 6 is a front sectional view of the head. 1... Housing, 2... Switch, 3... Fitting hole, 4... Diaphragm seal, 5... Operating rod assembly, 6... Guide, 7... Plunger,
8... Operating rod, 9... Slider, 10... Stopper, 15... Return spring, 16... Receiving piece,
17...Spring for overtravel, 20
... Head, 21 ... Screw, 22 ... Plunger, 23 ... Guide cylinder, 24 ... Stopper, 25
... Stepped portion, 30 ... Rotating shaft, 31 ... Notch portion,
32... Receiving piece, 33... Auxiliary spring.

Claims (1)

[Scope of utility model registration request] A switch 2 is accommodated in a housing 1, and an operating rod 8 for pressing the switch 2 is provided at one end of the housing, and between this operating rod and the housing 1, the operating rod 8 is always oriented toward one end. A return spring 15 is provided to bias the
Further, a plunger type head or a lever type head supporting the rotating shaft 30 is selectively and removably attached to one end of the housing 1, and these heads have fitting holes provided at one end of the housing 1. A guide tube 23 of the same outer diameter is provided in a protruding manner to be compatible with and detachably fitted to the lever-type head. 8. An enclosed type limit switch characterized in that an auxiliary spring 33 is provided between the plunger 22 and the head, which always biases the plunger 22 in one direction.