JPS6318289B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation switching mechanism for a control device, for example, a power frequency counting type digital timer.

Typically, this type of digital timer requires a power supply of 50
It is necessary to switch the operation depending on whether it is Hz or 60Hz.
Conventionally, two octal pins were used to switch between shorting and opening, and a switch was installed on the side of the case.

However, in the former case, the switching operation is complicated and two octal pins are required just for switching, which is an obstacle to adding other functions. In addition, in the latter case, the control equipment itself becomes larger and costs increase.
Moreover, since the mounting holes are made on the side of the case, there is a drawback that dust inevitably enters the case.

The present invention has been made in view of these drawbacks, and its objectives are to provide an easy switching operation, no special octal pins required for switching, good insulation of the switching member, and Moreover, it is an object of the present invention to provide an operation switching mechanism for a control device that is compact, space-efficient, can be manufactured at low cost by using an existing key part, and prevents dust from entering.

The present invention will be described below with reference to the accompanying drawings.

1 to 8 show a first embodiment of the operation switching mechanism according to the present invention, where 1 is a base of the device and 2 is an octal pin provided on the base 1. FIG. Reference numeral 3 denotes a key part integrally formed in the center of the base 1, and is a hollow body with an end opened in the axial direction. 5 is a printed circuit board attached to base 1, and the power supply is 50Hz or 60Hz.
Printed wiring lines 6 and 7 are formed to constitute a circuit that switches operations depending on the frequency of Hz.

8 is a terminal, and the threaded part 1 of the conductive shorting screw 14
5 is formed with a screwable female thread 9, and protrusions 10, 10 are inserted from one side of the printed circuit board 5 into the hole of the circuit board 5, and are connected to the wiring 6 by soldering. Reference numeral 11 designates another terminal, which has a hole 12 through which a threaded portion 15 of a shorting screw 14 can be inserted, and protrusions 13, 13 are inserted into the hole of the printed circuit board 5 from the other side of the printed circuit board 5, and soldered to the wiring 7. connected.

Therefore, these terminals 8, 11 are connected by inserting the shorting screw 14 into the hollow part 4 of the key part 3,
By screwing the terminal 8 into the female thread 9 of the terminal 8, the seat surface 16 comes into contact with the terminal 11, and a short circuit is created via the short circuit screw 14. On the other hand, the terminals 8 and 11 are connected to the shorting screw 14
It is opened by removing it. Depending on whether the circuit is short-circuited or open, it selectively switches between 50Hz and 60Hz operation.

9 to 12 show a second embodiment, 1
7 and 18 are terminals, one end of which is inserted into a hole in the printed circuit board 5 and connected to the wirings 6 and 7 by soldering. Reference numeral 19 denotes a post made of an insulating material such as resin, one end of which is in contact with the printed circuit board 5, and the bent portions 1 of the terminals 17, 18 are attached to stepped portions 20, 21 formed at the other end.
7a and 18a are engaged with each other, are integrally fixed to the printed circuit board 5, and are located within the hollow portion 4 of the key portion 3. Moreover, the bent portions 17a, 18 of the terminals 17, 18
The diameter of a is larger than the dimension a of the steps 20 and 21 of the strut 19.

Therefore, these terminals 17 and 18 are connected by screwing the conductive shorting screw 23 into the female thread 22 of the support column 19 so that the seat surface 24 is connected to each bent portion 17a and 18.
a and is short-circuited via the short-circuit screw 23.
On the other hand, the terminals 17 and 18 are opened by removing the shorting screw 23.

In the first and second embodiments, the shorting screw 14,
23 is screwed onto the female thread 9 of the terminal 8 or the female thread 22 of the support 19, and its head is positioned within the hollow portion 4 when both are screwed together. In this way, the shorting screws 14 and 23 are not only insulated from the outside, but also protected from contact with foreign objects, and erroneous switching due to careless operation can be prevented. Moreover, the shorting screws 14, 2
The tip of the screwdriver can be guided by the hollow part 4 during screwing and unscrewing of the screwdriver 3, which is convenient for the work.

In addition, as the conductive pin members, short-circuiting screws 14 and 23 fixed by screw connection were used in all the embodiments, but press-fit type pins may be used as long as they have sufficient fixing strength against vibration etc. It may be hot.

As is clear from the above description, the present invention utilizes the existing key part provided on the base, and has two terminals for operation switching in the hollow part and a conductive pin member for shorting them. It has a space-efficient, compact configuration and can be manufactured at low cost, and there is no need to drill a mounting hole in the side of the case as in the above-mentioned conventional case, so there is no risk of dust intrusion. Also,
The terminal and the conductive pin member are insulated from the outside by the key portion, and are protected from contact with foreign matter and damage caused thereby, and the possibility of erroneous switching due to careless operation can also be eliminated. Furthermore, since the two terminals are connected to printed wiring on a printed circuit board provided on the base, internal connection of the terminals is easy and various modes of operation switching can be accommodated. Moreover,
The two octal pins that were conventionally used for switching operations are now freed, allowing the control equipment to have other functions.

[Brief explanation of the drawing]

1 to 8 show a first embodiment of the operation switching mechanism according to the present invention, in which FIG. 1 is a back view, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. Fig. 4 is a front view of the shorting screw, Fig. 5 is a plan view of the terminal, Fig. 6 is its side view, Fig. 7 is a plan view of another terminal, and Fig. 8 is its side view. be. 9 to 12 show a second embodiment,
9 is a back view, FIG. 10 is a sectional view taken along the line -- in FIG. 9, FIG. 11 is a plan view of FIG. 9, and FIG. 12 is an exploded perspective view of the main parts. 1... Base, 2... Octal pin, 3... Key part, 4... Hollow part, 5... Printed circuit board, 6,
7...Printed wiring, 8, 11...Terminal, 9...
Female thread, 14... Shorting screw, 17, 18... Terminal, 19... Support, 22... Female thread, 23... Shorting screw.

Claims (1)

[Claims] 1. A control device having a plug-in terminal having a key portion in the center of the base and an octal pin arranged around the key portion, the key portion being a hollow body opening outward, and a key portion for switching operations. A printed circuit board on which printed wiring constituting a circuit is formed and mounted on the base, and two terminals for operation switching connected to the circuit and installed in the hollow part of the key part in an electrically open state. and a conductive pin member that is attachable to and detachable from the outer opening in the hollow part of the key part, and that is located in the hollow part when attached and contacts the two terminals to short-circuit them. Operation switching mechanism for control equipment.