JPS58903Y2 - magnetic proximity switch - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a magnetic proximity switch composed of a permanent magnet and a reed switch.

Generally, this type of magnetic proximity switch is often used as a crime prevention door switch by attaching a permanent magnet to the door and a reed switch to the outer frame of the door to detect the opening/closing of the door.

However, if the reed switch is installed on the switch base in an exposed state, the reed switch's terminal screw or base fixing screw may sometimes be tightened incorrectly with a screwdriver, causing the tip of the screwdriver to touch the outer shell of the reed switch. May damage glass tubes.

Therefore, in the past, a cylindrical protector was provided on the switch base made of insulating material, and the reed switch was coaxially inserted through the opening at one end of the protector, and the reed switch was inserted into the through hole provided in the blocking wall at the other end. Insert one terminal wire and lead it out to the outside, solder both the left and right terminal wires of the reed switch to the external terminal pins planted in the switch base, and surround the glass tube of the reed switch with the protector. There is a known method that attempts to prevent the glass tube from being damaged during assembly work or during use of the reed switch.

However, in the conventional structure described above, since the outer periphery of the glass tube of the reed switch is surrounded by a protector, the switch can be sufficiently protected. It is difficult to maintain and inspect the reed switch because it is housed coaxially within a cylindrical protective body, making it impossible to visually see the state of the reed switch's contacts and to check for welding of the contacts.

In addition, during assembly, it is troublesome to coaxially insert the reed switch through the opening at one end of the cylindrical protector, and then insert the terminal wire of the reed switch into the through hole provided in the blocking wall at the other end, which is particularly troublesome. If the terminal wire is not straight, it is extremely difficult to insert it.

This idea was made to improve the above drawbacks.
To provide a magnetic proximity switch in which the contact status of the reed switch can be visually checked, assembly and removal work is easy, and the reed switch can be reliably protected.

Hereinafter, embodiments of this invention will be described based on the drawings.

In Figures 1 and 2, 1 is a switch base, and base fixing screws 2 are located near both left and right ends of the switch base 1.
, 2, and a pair of left and right terminal plates 4 between them.
, 4 are provided respectively.

5 is a reed switch operated by a permanent magnet (not shown), and terminal wires 6, 6 at both left and right ends are connected to the terminal plate 4.
, 4 are connected between the tip portions 7, 7.

8 is a covering piece integrally formed on the switch base 1;
As shown in FIG. 3, the cross section is formed in an inverted shape.

That is, the covering piece 8 includes a standing wall 8a integrally erected on the switch base 1, and an upper wall 8b extending horizontally above the reed switch 5 and protruding from the upper end of the standing wall 8a.
It has an open part 8C between the upper wall 8b and the switch base 1 on the reed switch 5 side, and
Reed switches 8 are placed on both sides of the standing wall 8a.
and terminal screws 9, 9 are provided.

Therefore, when tightening the terminal screws 9, 9 and the base fixing screw 2゜2, even if you accidentally operate the driver and the tip of the driver slides toward the reed switch 5 side, it will be removed by the cover piece 8.
Since the receiver is stopped by the vertical wall 8a and upper wall 8b, the outer glass tube 10 of the reed switch 5 will not be damaged.

In addition, the contact status of the reed switch can be visually checked through the opening 8C of the inverted-shaped covering piece 8, making maintenance and inspection easy, and the reed switch 5 can be easily assembled from the opening 8c of the covering piece 8. .

In addition, in FIG. 1, 11.11 is the lead wire connected to the terminal screws 9, 9, in FIG. 2, 12.12 is the threaded hole of the terminal screw 9, 9, 13 is the cover of the switch base 1,
14.14 is an outlet for the lead wire 11.11.

As described above, according to this invention, when tightening the terminal screw or base fixing screw, even if the driver is operated incorrectly, the outer glass tube of the reed switch can be prevented from being damaged. In addition, the contact status of the reed switch can be visually checked from the open part of the inverted-shaped cover piece, making maintenance and inspection easy, and the reed switch has the advantage of being easily assembled from the open part of the cover piece. .

[Brief explanation of drawings]

FIG. 1 is a plan view showing the internal structure of the magnetic proximity switch of this invention, FIG. 2 is a perspective view of the switch base and cover, and FIG. 3 is a sectional view taken along the line A--A in FIG. 2. 1... Switch base, 2, 2... Base fixing screw, 3.3... Charging hole, 4, 4...
...Terminal board, 5...Reed switch, 7,
7...Tip part, 8...Coating piece, 9,9
...Terminal screw, 10 ... Outer shell glass tube, 8a ... Standing wall, 8b ... Top wall, 8C
...Open area.

Claims (1)

[Scope of utility model registration request] Insertion holes for base fixing screws are provided near both left and right ends of the switch base, and a terminal board with a pair of left and right terminal screws is provided between them, and both terminal wires of the reed switch are connected to the tip of each terminal board. In the connected and fixed magnetic proximity switch, an outer glass tube of the reed switch is located between the reed switch and a threaded hole for a terminal screw formed in the switch base and fixing each of the terminal plates to the base. A vertical wall extending in the axial direction of the reed switch and integrally formed with the switch base, and an earthen wall extending horizontally and projecting from the upper end of the vertical wall so as to cover the upper surface of the reed switch. The vertical wall is integrally formed with the switch base over at least the entire length of the glass tube and between the holes, and the vertical wall is formed integrally with the switch base between the earthen wall of the covering piece and the switch base. is a magnetic proximity switch characterized in that an open part is formed over the entire length of the reed switch.