JPS5816090Y2 - Limit switch operation display device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a display device for displaying the operating state of a limit switch by blinking a lamp.

1a and 1b are known as devices for displaying the operating state of a switch by blinking a lamp.

In FIGS. 1a and 1b, reference numeral 1 indicates a cover that is attached to a nozzle with a built-in switch, and this cover 1
A transparent plate 3 to which a name plate 2 is fixed is removably attached with attachment screws 4.

A display lamp 5, a voltage drop resistor 6, and a pair of springs 7 are supported on the plate 3. The lamp 5 and the resistor 6 are connected to a spring I.

7 are electrically connected in series.

The position of this spring I is selected such that when the cover 1 is attached to a predetermined position of the housing 7, it comes into contact with the terminals of the switches built in the housing.

Therefore, depending on whether the terminal with which the spring 7 is in contact is for a normally open contact or a normally closed contact, the lamp 5 will appear when the switch is activated or deactivated.
lights up and is displayed from the window 2a of the name plate 2.

Also, if the plate 3 attached with the mounting screws 4 is removed from the cover 1 and installed after being rotated by 180 degrees, the springs 7 will come into contact with different terminals of the switch, so the relationship between the switch status and lighting will change. is reversed.

However, in the structure shown in FIGS. 1a and 1b, the sealing performance between the plate 3 and the cover 1 is maintained by the seal 8, so the sealing performance may become incomplete due to individual differences during installation. Yes, it is not good or bad in terms of reliability.

Furthermore, when the plate 3 is inverted and attached to the cover 1, the letters etc. formed on the name plate 2 are upside down, and the relationship between the mounting position and the operating state of the switch is unclear. There are some inconveniences involved.

This invention aims to provide a limit switch operation display device that can eliminate the various drawbacks mentioned above, and one embodiment thereof will be described below with reference to the drawings.

A circular opening 11a is formed in the cover indicated by reference numeral 11 in FIGS. 2a and 2b, and a dish-shaped plate 12 made of a translucent material is screwed into the opening 11a.

Further, the name plate 13 fixed to the cover 11 so as to close the opening 11a has two windows 13a and 13b.
The bracket 12 can be seen through.

Note that reference numeral 14 indicates a seal provided between the cover 11 and the plate 12.

On the other hand, a dish-shaped bracket 15 made of a translucent material
is arranged so as to protrude into the recess of the cover 11, and is brought into a predetermined position by snap-in engagement of the 7-ramp portion 15a with the hook m11b of the cover 11, that is, the first position relative to the plate 12 and this position. 1st
It is removably held at one of the second positions rotated 180 degrees from the position.

As shown in detail in FIGS. 3a, b, and c, this bracket 15 has a planar shape that is symmetrical across center lines L1 and L2, which are orthogonal to each other, and has a cross shape on its side. A projection 15b is formed, and the inside of the projection 15b is a recess 15c that opens to the other surface of the bracket 15.

A lamp 16 and a resistor 17 connected in series are housed in the recess 15c.

Further, one ends of springs 18 are fixed to the inner surface of the bracket 15 at symmetrical positions across the center line L2, and between the springs 18 and 18, the lamp 16
A series circuit consisting of a resistor 11 and a resistor 11 is connected.

Furthermore, on the upper surface of the protrusion 15b, a display indicating the operation mode of the switch (for example, rNcJ
, rNOJ) are formed.

The positions of the indicators provided on the lamp 16 and the protrusion 15b are selected to correspond to the windows 13a and 13b of the name plate 13, respectively, and the position of the spring 18 is selected so that the cover 11 is placed in a predetermined position on the housing (not shown). The switch 19 is selected so as to be in contact with any two of the four terminals of the switch 19 when it is attached to the switch 19 (as shown in FIG. 2).

I1. If the lamp 16 is lit, this lamp 16
The light emitted from the window 1 of the name plate 13 passes through the transparent bracket 15 and the plate 12.
A light emitting display is made to the outside from 3a.

At the same time, one of the displays formed on the protrusion 15b (in this case, the letters "NC'l") is displayed externally through the window 13b.

Further, since the bracket 15 is symmetrical with respect to the center line L1, it can be mounted with the bracket 15 rotated by 18.0 degrees with respect to the cover 11.

This state is shown in FIGS. 4a and 4b.

In this state, the spring 18 contacts the other terminal of the switch 19, and at the same time, the characters ``'NOJ'' appear in the window 13b instead of the characters 1'-NCj.

As explained above, according to this invention, the name plate 13 and the plate 12 are fixed to the cover 11.
1, and by simply changing the direction of the bracket 15, the display can be changed in response to changes in the operating state of the switch, and various effects as described below can be obtained.

1 It is possible to confirm from the outside whether the built-in switch is using a normally closed contact or a normally open contact.

2. There is no need to remove the plate when changing the display state, so there is no deterioration in sealing performance.

3. Since most of the plate is covered by the name plate, the plate is less likely to be damaged.

[Brief Description of the Drawings] Figure 1a is a front view showing a conventional display device, Figure 1 is a sectional view taken along line A-A in Figure 1a, and Figure 2a is an embodiment of the present invention. 2 is a sectional view taken along line B-B in FIG. 2a, FIG. 3a is a plan view showing the bracket of the device, FIG. 3 is a side view thereof, Figure C is a rear view thereof, Figure 4a is a front view showing the display devices of Figures 2a and b in different states, and Figure 4 is a sectional view taken along the line C--C of Figure 4a. It is. 11...Cover, 11a...Opening, 1
2...Brate, 13---Name plate, 13a, 13b...Window, 15...
... Bracket, 15a ... Song 7 lunge section, 15b ...
...Protrusion, 15c...Curved recess, 16...Lamp, 17...Resistor, 19...Switch. 18... Spring,

Claims (1)

[Scope of utility model registration request] Cover 1 attached to the limit switch housing
1 is provided with an opening 11a, and a translucent plate 12 is attached to this opening; inside this plate, there is a first position relative to this plate, and an opening 18 from this first position.
A translucent bracket 15 is provided, which is detachably attached to either of the second positions rotated 0, and this bracket is provided with a protrusion 15b that protrudes toward the plate, and this protrusion □ is connected to a switch. A display indicating the operating mode is provided at a line-symmetrical position corresponding to the first and second positions, and the bracket 15 is provided with a switch built in the housing when the bracket is in the first position. A pair of springs 18 are provided which are in contact with the normally closed contact of the switch and in the second position are in contact with the normally open contact of the switch. A name plate 13 is provided on the front of the plate 12.
Furthermore, in the part of this name plate corresponding to the lamp 16, there is a window 13a that displays the lighting of this lamp.
and a limit switch operation display device in which a window 13b for displaying the above display is provided in a portion corresponding to one of the above displays.