JPH02829Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a switch mechanism for traps in equipment, and more specifically, a switch mechanism for traps in equipment in which the circuit is closed by attaching a bonnet to the chassis. This relates to the switch mechanism.

[Conventional technology]

The trap switch mechanism of this type of equipment is
Examples such as those shown in Figures a and b are known. Here, a limit switch b is provided on the chassis a, and when the bonnet c is covered, the detection circuit d is activated when the switch b is turned on.

In this way, the attachment and detachment of the bonnet c and the on/off of the detection circuit d are related, and once the bonnet is opened, it is possible to turn off the power because a high voltage section is installed inside the bonnet. This means that access by third parties is not allowed by removing the bonnet, so it is useful in, for example, terminal equipment of CATV systems and dangerous equipment with high voltage parts.

[Technical issues]

However, if the trap switch mechanism of such equipment is adopted for example in the terminal device of a CATV system, the limit switch can easily be used by someone who attempts to modify the internal structure by opening the hood and spying on channels other than those under contract. Therefore, if the limit switch is modified, it will prevent the detection circuit from detecting the removal of the bonnet, resulting in problems such as being ineffective in preventing unauthorized viewing.

[Purpose of the invention] The present invention is an attempt to solve the above-mentioned problems, and is to provide a trap for equipment that can temporarily stop the functionality of the equipment when the bonnet is opened without being visually recognized. The purpose is to provide a switch mechanism.

[Technical structure of the invention]

For this purpose, the present invention provides a device equipped with a switch mechanism that is turned on by attaching a bonnet to the chassis of the device. The bonnet comprises a terminal and a detection circuit that is received on the chassis side and becomes electrically conductive with the screws through the terminal when a plurality of screws are screwed into the screw receiving member. , the screws are attached to the chassis via a screw receiving member through a bonnet holding member, and the screws are electrically connected to each other via a conductive portion attached to the bonnet holding member. It is characterized by:

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. First, in these figures,
Reference numeral 1 indicates a chassis, to which a screw receiving member 2 made of synthetic resin is fixed with bolts 3 or the like. This screw receiving member 2 has a hole 4 formed on its lower side that cannot be seen from the outside, has a pair of screw holes 5, 5, and serves as a conductive protrusion in which a terminal may be provided. It has metal inserts 6,6. In correspondence with the screw holes 5, 5, a fitting hole 7 is opened on the upper surface of the screw receiving member 2, into which a bonnet holding member 8 made of synthetic resin can be fitted. The bonnet holding member 8 has insertion holes 9, 9 formed therein corresponding to the screw holes 5, 5, and a conductive sheet 10 serving as a conductive portion is attached to the bottom.

If necessary, the conductive sheet 10 is housed in a space 11 formed below the bonnet restraining member 8 while being supported from below by a restraining plate 19.

Further, a flange 12 is formed on the outer periphery of the upper edge of the bonnet holding member 8.
3 is engaged. In addition, in the figure, the code 14 is
The bolt 15 is inserted into the screw holes 5, 5 through the insertion holes 9, 9.
It shows the space formed into which the head fits when screwed together.

Further, before the screw receiving member 2 is attached to the chassis 1, terminals 18, 18 of the detection circuit 17 are provided by screwing bolts 16, 16 into the screw holes 5, 5 from below.

Since the configuration is as described above, the bonnet 13
is attached to the chassis 1 by screwing bolts 15 into the screw holes 5, 5, and by unscrewing the bolts 15, the bonnet holding member 8
At the same time, the bonnet 13 is removed from the chassis 1. For this reason, this bolt does not look like chassis 1.
It is recognized as a function for attaching the bonnet 13 to the bonnet 13.

However, as is clear from FIG. 4, the detection circuit 17 is closed and turned on via the bolt 16, the metal insert 6, the bolt 15, and the conductive sheet 10; When removed, both inserts 6, 6, which are conductive protrusions,
The detection circuit 17 is opened and turned off.

This is because, from the outside, the detection circuit 17 cannot recognize whether it is opened or not, and is completely unaware that there is another function in addition to the original functions of the bolt and screw hole.

[Effect of idea]

As is clear from the above explanation, the present invention uses a connection structure that connects the bonnet and chassis to configure a switch mechanism that stops the function of the device if it is opened without permission. The switch in the detection circuit that detects when the hood is opened cannot be recognized from the outside, so if the bonnet is opened, the device will no longer function normally.
It has the effect of preventing eavesdropping on CATV systems and preventing accidents caused by contact with high-voltage parts.

[Brief explanation of drawings]

Figures 1a and 1b are side views and circuit diagrams showing how the conventional example is used;
b and c are a side view, a bottom view, and a vertical side view of a bonnet holding member according to an embodiment of the present invention, and Fig. 3a,
b is a plan view and a vertical side view of the same screw receiving member;
FIG. 4 is a longitudinal sectional side view of the whole. 1... Chassis, 2... Screw receiving member, 3...
Bolt, 4...Empty, 5...Screw hole, 6...Insert, 7...Fitting hole, 8...Bonnet holding member, 9...Through hole, 10...Conductor sheet, 11
... Space, 12 ... Flange, 13 ... Bonnet, 14 ... Space, 15, 16 ... Bolt, 17
...Detection circuit, 18...Terminal, 19...Suppressing plate.

Claims (1)

[Scope of utility model registration request] A trap switch mechanism for equipment that includes a switch mechanism that is turned on when a bonnet is attached to the chassis of the equipment includes a screw receiving member that is fixed to the chassis and a screw that is fixed to the screw receiving member. a bonnet holding member that fixes the bonnet by the bonnet holding member; a conductive sheet that maintains a state of contact with the conductive protrusion of the screw receiving member when the bonnet holding member is fixed to the screw receiving member on an invisible portion of the bonnet holding member and the bonnet holding member; The conductive sheet is held down by a holding plate with a hole through which the conductive protrusion fixed to the screw receiving member passes, and the holding plate, the conductive sheet, and the bonnet holding member are provided with a hole that is common to the center. It is characterized by having at least two screw holes, a terminal provided on the conductive protrusion, and a detection circuit connected between the terminals, so that it can be detected when the bonnet is removed from the chassis. Switch mechanism for trapping equipment.