Switch

A switch and component technology, applied in the field of safety switch with locking mechanism, can solve the problems of cam plunger damage, trouble, falling off, etc., and achieve practical and convenient effects

Inactive Publication Date: 2003-03-12
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Either way, when the door is to be opened directly and forcibly in the locked state without performing the unlocking operation, the built-in cam will be forcibly rotated due to the key being pulled out, and the following defects sometimes occur: the cam and the The plunger, etc. operated by it is damaged to rotate the cam, pull out the key, and open the door. Because of this damage, the switching mechanism remains in the ON state of the switch. Although the door has been opened, the power circuit is still connected. The working machinery is still in motion
Therefore, when carrying out the above-mentioned maintenance work or wiring work before installing the top case, etc., it is necessary to cut off the main power supply installed elsewhere, and then turn on the main power supply after the work is completed, which is very troublesome.
[0009] In addition, when opening and closing the door, it is possible that the top case 73 will fly out from the body case 71 due to an excessive impact load, etc., thereby opening the door while the working machine is still in motion.
[0010] In addition, as the reason why the top case 73 floats out from the main body case 71, when the key switch for the door switch is not equipped with a brake for the door, when the door is closed with force, the impact load at that time will directly act. On the top shell 73, a very heavy door may cause the top shell 73 to float or fall off from the body shell 71 due to the closing impact.
In addition, when the key is deformed and the door is closed, the key 75 will not be inserted into the key insertion hole 74 but hits the top case 73, which may cause the top case 73 to float out from the body case 71.
[0011] In addition, the key switch (door switch) with electromagnetic interlock function locks the switching mechanism by closing the door, but when the electromagnetic lock is used as a door lock without a stopper and a hook, the electromagnetic lock is When the door is forced to open tightly, the cam in the top shell will not be able to rotate due to the locking of the switching mechanism, so the key will be pulled out forcibly together with the door when the key is engaged on the cam, sometimes causing the The top shell 73 floats out from the body shell 71

Method used

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Embodiment 1

[0233] exist Figure 33 ~ Figure 38 In the shown embodiment 1, the upper end of the body shell 3 is fitted with the top shell 4, so a closed operation chamber b is formed, and the operation chamber b is equipped with a device for pressing the plunger 15 against the return spring 14. The forced displacement device 26 of displacement.

[0234] A pair of left and right spring members 10 are installed on the forced displacement device 26 as a forced operation member for forcing the plunger 15 to be pressed in, and the plunger 15 can move up and down between the two spring members 10 . The spring member 10 is formed by stamping and bending a leaf spring, such as Figure 38 As shown in the plan view of , it is press-fitted through the connecting hole 23 and fixed on the connecting pin 52 that is uprightly arranged on the bottom surface of the operation chamber b. And on each spring member 10, the operating arm 10a bends and protrudes toward the plunger side in a cantilever shape. ...

Embodiment 2

[0243] Figure 39 ~ Figure 41 A modified example of the spring member 10 constituting the forced displacement device 26 is shown. In this example, the spring member 10 is formed of a single plate spring, and the operation portion 10b facing the stepped portion 15b of the plunger 15 and the operation lever 10c are integrally formed. Others are the same as the above-mentioned embodiment 1.

[0244] In this example, in the state where the top case 4 is properly fitted and connected to the upper end of the main body case 3, the operating rods 10c of each spring member 10 are pressed and displaced downward through a part 4a of the top case 4, as Figure 39As shown, the operating portion 10 b of the spring member 10 is moved back to a position that allows upward displacement necessary for switching the contacts of the plunger 15 . After the top shell 4 is separated from the body shell 3, then as Figure 41 As shown, the operating portion 10b of the spring member 10 that has been ...

Embodiment 3

[0246] Figure 42 Other embodiments of the forced displacement device 26 are shown. The forced displacement device 26 of this example consists of a cam 51 that can rotate around the horizontal axis C, a spring 62 that presses the cam 51 to rotate counterclockwise, and a column for forced displacement that can move up and down with the rotation of the cam 51. The plug 63 is constituted, and the plunger 63 for forced displacement is provided facing the upper end of the movable member 12 .

[0247] In this example, when the top case 4 is properly fitted and connected to the upper end of the body case 3, the protrusion 4b protruding from the top case 4 blocks the top of the spring 62, so that the pressure of the spring 62 does not act on the cam 51. state, at this time, forced displacement with plunger 63 such as Figure 42 As shown in (a) and (b), it is in a state where the movable member 12 is allowed to move up and down. And when top shell 4 is separated from body shell 3, t...

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Abstract

The invention provides a switch which can avoid a state in which a switching mechanism does not meet a key-insertion / removal state by changing it over to a proper contact change-over state brought about at time of pulling out of the key, even if a key is pulled out for operation by force in a locked state. With the switch provided with a switching mechanism 5, an operation mechanism 8 changing over the switching mechanism 5 by making a positive and a negative operations according to insertion and removal of a key 2, and lock mechanism 6 maintaining a switch-on state brought about by insertion of the key 2, it is so structured that, when a pulling-out load beyond the set value is applied to the key 2 in a locked state, a locking function of the lock mechanism 6 is forcefully released, and the operation mechanism 8 and the switching mechanism 5 are to be changed over to a proper switch-off state as is brought about in case the key 2 is not inserted.

Description

technical field [0001] The present invention relates to switches such as limit switches and key switches, and more specifically, to a safety switch with a locking mechanism suitable for door switches and the like. Background technique [0002] Door switches, such as key switches, are used to detect the opening and closing of the door at the entrance and exit of the operating area of ​​​​the automatic working machine and switch the power supply. Usually, the key is set on the door, and the switch is set on the fixed frame of the entrance and exit. When the door is closed, the key installed on the door is inserted into the switch body installed at the entrance and exit, and the inserted key is used to operate the built-in cam to rotate, so that the switching mechanism built in the switch body is switched to the switch-on state, and the power circuit is connected etc., and when the door is opened, because the key is pulled out, the built-in cam is operat...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01H27/00
CPCH01H27/007Y10T70/437H01H2027/005H01H27/002
Inventor丹羽孝志森山裕幸本多末明吉井实川田一树三好哲彦穐山信悟梶尾博行竹中英光
OwnerORMON CORP