JPS58206015A - Limit switch - 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] The present invention provides a switch built in a case, which is operated by sweeping a plunger attached to the case to close the switch. IJ with operating point adjustment function and overtravel function
Gumako/Gumako on the configuration improvement of i, door, i, =-
The conventional structure of a conventional limit switch for the F4IC will be explained with reference to FIG. In the figure, l is a protective case for the limit switch, and a switch 2 configured as, for example, a snap, a push, and a switch is installed inside this case. As is well known, the switch 2 is attached to a base 3 and has a fixed contact rotation 41, a swivel 41, and a 6% return spring supported on a push rod 5. 7, etc., and presses the ℃ push rod 5 against the return spring 7&C. Point 6 switches to open and close. On the other hand 1. A granger 8 is installed passing through the end of the case l. The pusher 8 engages with the sleeve 9 attached with its tip exposed outside the case, and the pusher 8 engages with the sleeve 9.
A press rod 11° is slidably fitted into the press rod 11, an adjustment screw 12 is screwed into the press rod 11 with the bolt head in contact with the push rod 5, and a spring 13 is compressed and inserted between the receiver 10 and the press rod 11. , and a return spring 14 compressively inserted between the case l and the sleeve 9. Note that 15 is the outer cylinder of the plunger attached to the case l. and sleeve 9 of plunger 8
When R is stroked externally to push the lever J into the detecting body (not shown), first the holder 1ol and the spring 1
3.

The push rod 5 of the switch 2 is pushed down via the push rod 11 and #setting screw 12, and the switch 2 is operated.

Here, the opening/closing strokes of the built-in switches 2, such as snappers, bushes, and chisels, are generally much smaller than the movement strokes of the granger 8 operated by the detection object, and for this reason, both of the above-mentioned stores a- In Figure 1, this overtravel mechanism is used to absorb pressure differences and prevent excessive loads from being applied to the built-in switch contacts.
1, with an FE blade 13 interposed between the FE and the FE spring 13.

In addition, in order to set the switch correctly on the evening moon, it is necessary to set the operating point of the inner ridge switch 2 for the straw and 7 Randai of Zunja 8 to be: J4'lI. Yes, this is a summary of the adjustment screw 1 in the diagram (see below).
I'm going to do it by 2, so I'm going to do it by 5.

However, in the conventional structure shown in Fig. 81, the plunger 8 is equipped with the overtravel structure and the adjustment screw as described above, so the structure of the core is extremely large and complicated. Moreover, the manufacturing cost is relatively high as the number of component parts is large and the assembly work in a cramped space is a hassle. If you do it with a ff12-shaped bow, it won't work properly, and the adjustment screw 1.2 of this main stand requires work with 7 pins, which is troublesome, and what's more, the adjustment screw 1
When operating the screw 2, use an art tool to rotate the press rod 11 so that it does not rotate.
In addition, after adjusting the switch operating point, the tip of the pressure rod 11 was caulked to prevent the adjusting screw 12 from loosening. This work had to be done in a narrow space and was cumbersome.

In this invention, a cancer is inserted into the upper point of the pi.
The purpose is to eliminate the drawbacks of the conventional structure, and to provide a structure that has been cleverly designed to simplify the assembly process and the adjustment of the switch operating point.

According to the present invention, this purpose is achieved by the built-in system 4. A hollow chamber opened to the side is formed at the end of the push rod of H, and a compression spring and a spring, water, and sea which are pressed and urged toward the plunger on the case side by the compression spring are formed in this hollow chamber. At the same time, the tip of the push rod is loosely inserted through the operating end side of the adjustment screw that comes into contact with the plunger, and is screwed into the nut pusher.This is achieved by constructing an overtravel mechanism with these and other parts. .

Embodiments of the present invention will be described below based on the drawings.

2 and 3, the built-in λ
The push rod 5 of the Evechi 2 has an end on the operation end side &f:fu
An open middle chamber 16 is formed in the llj5, and the spring constant is larger than that of the operating spring of the corridor 6 inserted here.
The spring 17 and #compression spring 17 push the spring toward the spring 8, dob, shi, ]! 4 is mediated. - A hole 19 with a larger diameter than the tXillill screw 12 is bored at the missing end of the N5. Then, an adjusting screw 12 is inserted through the hole 19 from the operating end side.

Dobu, Shu 18 - Even if it's 1, it's ru. In addition, as clearly shown in FIG.
A rectangular anti-rotation 7-lunge fitting is provided to prevent rotation in the hollow chamber 16 when the screw is inserted into the hollow chamber 16. Note that the adjustment screws, f, groove, and shell may be made of gold 1L or synthetic material in consideration of insulation properties.

At *t above, in the normal free state trend (Fig. 2
The whole of the pusher 15 is pushed upward by the return spring 7 as shown in al, and the pressure spring 1
7 K, it is pressed toward the operating end side inside the hollow chamber.

From this state, as shown in Fig. 2 (I)), 9
When the plunger 8 is pushed in from the outside in the direction of the arrow by the ejection, the adjustment screw 12. 18. Pressure 0
Push through spring 17! The whole of '115 was lowered against the return 7, and in this process, the great light was +7vy! After the push rod 5 is moved and the displacement of the push rod 5 reaches the point 7, the compression spring 17 is bent as shown in the figure, and the plunger 80 becomes large 1.
Overtravel is performed by making 9 strokes of the 0 stroke displacement and the operating stroke C of the built-in switch 2. In other words, in the past, the overtravel mechanism was configured on the plunger side as shown in Figure 1 (1). 5
Further, the operating point of the built-in switch 2 is adjusted by operating the adjustable screw 12 shown in FIG.

According to the above configuration, each part that releases the overtravel mechanism to the push rod 5 of the built-in switch 2, and the viscous adjustment screw i2
are all attached, so the plunger 8 on the case side that is stroked by the detection object can be a single molded part with a simple shape as shown in Fig. 5, and the structure and case l
Assembly is extremely hectic. Furthermore, the structure of the push rod that constitutes the overtravel mechanism is simpler and requires fewer parts than the conventional plunger structure shown in FIG. 1, and can be assembled at the factory where the switch 2 is manufactured. Furthermore, as mentioned above, since the plunger has a simple structure, the dimensional accuracy is also good, so the built-in switch operating point can be adjusted at an earlier stage without having to do it after assembly. It is also possible to move the screw 12 by feeding it into the row 5, making the adjustment work much easier than in the conventional case. In the nine embodiments shown in FIG. 2, the hollow chamber 16 of the push rod 5 Although both the left and right sides are open, it is also possible to open only one side and leave the other side closed by a wall, as shown in Figure 4.In fact, the structure shown in Figure 4 is better. Positioning of force, thorn, shi & 18 can be done easily. Also shown in Figures 6 and 7.

A specific example of Dobu, Shu 18 will be shown. In other words, in Figure 6,
In addition to the above-mentioned square flange 2o for preventing rotation, the stem 18 has a compression spring [7] on its outer peripheral surface.
The body part 21 is fitted and guided, and the slot 22 is set slightly smaller than the thread diameter of the adjustment screw [2] to adjust the inner diameter.
A female thread 24 is cut on the inner circumferential side of the groove.

In addition, the example shown in Figure 7 is made as a synthetic resin molded product, with 24 female threads and up to the body part 21, and the phantom inner diameter of the cylindrical tip with a slot. It is slightly smaller than the outer diameter of the Il adjustment screw. If you screw in the J&Cv4 adjustment screw 12 as shown in Fig. 8 using the screwdriver 18, you will forcefully expand the slotted tip tube part O, so tighten the adjustment screw 18 as shown in the arrow. 12 is applied from the outside, and as a result, the effect of preventing the iEl setting screw from loosening after adjustment is obtained.

As mentioned above, this invention is completely unique.

The overtravel mechanism of the switch and the adjustment screw for adjusting the switch operating point v4 are all assembled on the push rod side of the built-in switch.
It has a small and simple structure, which makes it much easier to assemble 1-rim, Tosui, and 4-meters, and to perform V4 adjustment work where there is a risk of switch operation, and has various practical effects that greatly contribute to reducing manufacturing costs. be able to.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view with the case cover removed showing the structure of a conventional limit, tosui, and chi; Fig. 2 is a partially sectional front view of a built-in switch according to an embodiment of the present invention;
FIG. 2 fbl is a partial view showing the granger suppression state in FIG. 2 (alK), FIG. 31 is an exploded perspective view of the main parts in FIG.
The figure is a cross-sectional view showing the structure of the plunger portion according to the embodiment of the present invention, FIGS. FIG. 3 is a cross-sectional view showing the assembled structure of the main parts assembled using the top, top and bottom. 1... Case, 2... Built-in switch, 5... Push rod, 8... Plunger, Minoru... Adjustment screw, 16...
hollow chamber. 17...Compression spring, 18...S, spike, S, addition.
...Anti-rotation 7 langes, 21...Body, n...Slot, n...Tip cylinder, Sae...Female thread. Figure 21 Procedural Amendment (Method) 1. Incident display Tokugan Sho, j7-δ9SZ near 2,
Name of the invention Rimi 11. Yes5. ．． JR3, Relationship with the case of the person making the amendment Applicant 4, Agent 6 Sodemasa ζ The invention has a tip tube part with a number increased from this, and a female thread is threaded on the inner periphery. A limit switch characterized by a structure. 3. Detailed Description of the Invention The present invention provides a limit switch in which a switch built into a case is opened and closed by the stroke operation of a plunger attached to the case, and in particular a limit switch having a switch operating point adjustment function and an overtravel function. Regarding improvements.

Claims (1)

[Claims] l) A plunger is disposed in contact with the operating end side end of the push rod of the switch built in the case, and the inner bracken switch is opened and closed by operating the plunger from outside the case. In the limit switch, a hollow chamber is formed which is open toward the operating end side end K11 of the push rod of the built-in switch, and a compression spring is formed in the hollow chamber, and a barb is pressed toward the plunger by the compression spring. At the same time, a push rod is loosely inserted through the adjusting screw that contacts the plunger from the operating end side, and is screwed into the nut push, and these parts constitute an overtravel mechanism. A limit switch 02 characterized by a limit switch 02, a limit switch according to claim 1. It has a 7-lunge that prevents the navel, groove, and shoe from rotating, a body that guides the compression spring on the outer circumferential surface, and a slotted tip tube with an inner diameter slightly smaller than the outer diameter of the adjustment screw. II Mitutos-1, CH, which has a patented structure in which a female thread is cut on the inner periphery.