JPS62106386A - Switch mechanism of portable integrating meter - Google Patents

Abstract

PURPOSE:To prevent the erroneous operation of a power source switch, by fixing a switch cover member provided with a hole inserting an operation element for opening and closing a switch to a casing and providing the power source switch operated by the operation element to the lower part of the cover member. CONSTITUTION:A key 7 is inserted in the hole 6 of a switch cover 5 prior to starting work and the top part of a switch 3 is pressed by the leading end of said key 7 to apply voltage to each circuit apparatus in a meter and said circuit apparatus is brought to an energizing state. After this operation, a worker pulls out the key 7 to hang the same by the band strap mounted on a casing 1 or to trust the same to a manager. By this method, manual erroneous operation is prevented and it is prevented that the integration value of a radiation dose integrating/counting part is reset.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a switch mechanism for a portable integrating meter, such as an integrating radiation dosimeter.

(Prior art) In order to protect workers working in a radiation-generating atmosphere such as a nuclear power plant from radiation damage, workers are required to carry a meter while working to measure the amount of radiation they are exposed to and its integrated count value. .

As shown in Fig. 3, in the casing of this type of instrument, a rectangular switch cover C is normally inserted into a hole drilled in the casing a so that it can be pushed freely, and the detection section in the instrument is located below the switch cover C.
A power switch d is provided for energizing circuit devices such as a radiation dose counter and a radiation dose integration counter.

Therefore, in this type of device, since the switch d is operated by pressing the switch cover C, if the switch cover C is pressed by mistake, the voltage application to the radiation dose integration counter will be cut off. As a result, the accumulated value up to that point is reset, resulting in the loss of important index values for preventing radiation accidents.

(Objective) In view of the above-mentioned problems, it is an object of the present invention to provide an improved switch mechanism for a portable totalizer that can prevent the loss of the total value due to incorrect operation of the power switch. It is in.

(Means for Achieving the Object) That is, in order to achieve the object, the present invention fixes a switch cover member having a hole for inserting a switch opening/closing operator into a casing, and also fixes the switch cover member to the casing. The switch mechanism of a portable totalizing meter has a power switch operated by the operator at a lower position.

(Example) Therefore, the details of the present invention will be explained below based on the illustrated example.

Figure 1.2 shows an apparatus according to an embodiment of the present invention, with reference numeral 1 in the figure.
is a radiation detection unit (not shown) in the chassis 2 inside the instrument;
A casing equipped with a push-button power switch 3 that applies voltage to circuits such as the radiation dose counter and the radiation dose integration counter.
A rectangular hole 4 is bored in the part of the casing 1 corresponding to the arrangement value 1 of the switch 3, and a rectangular switch cover 5 made of synthetic resin having an insertion hole 6 for the key 7 is inserted therein.
This is integrally fixed to the side surface of the hole 4 using an adhesive or the like.

In addition, numeral 8 is a mode changeover switch for switching and displaying the radiation dose or its integrated count value, 9 is an i-scanning device operation switch, 1
0 indicates a switch cover for energizing the hold switch that holds the measurement JIM, and these have the same structure as the conventional one shown in FIG.

In the device configured as described above, before starting work, the key 7 is inserted into the hole 6 of the switch cover 5, and the tip of the key 7 is pressed against the top of the switch 3 to apply voltage to each circuit device in the meter to make it energized. Make it.

After performing such an operation, the worker removes the key 7 and hangs it on a hand strap (not shown) attached to the casing 1, or leaves it in the care of an administrator. As a result, the switch cover 5 prevents the switch 3 from being erroneously operated by hand, thereby preventing resetting the integrated value of the radiation dose integrating counter.

Note that the above-mentioned embodiments are not limited to integrating meters for radiation dose, etc.
It can be applied to a light meter that integrates light mlFrvf, and can also be applied to a rotary switch by providing a fitting part at the tip of the key 7 to fit into the head of the power switch 3. In general, the switch cover 5 can be configured to have the same shape as a switch cover of another mode changeover switch, etc., and can be used as another switch cover, or conversely, the other switch cover can be provided with an operator insertion hole. A switch/edge cover 5 can also be configured.

(Effects) As described above, according to the present invention, the switch cover member having the insertion hole for the switch opening/closing operator is fixedly installed in the casing, and the power switch is arranged below the fixed position. The switch cannot be opened or closed without permission unless using the operator, and therefore it is possible to prevent the reset operation of the integration counter during measurement due to erroneous operation, which can reduce the radiation exposure of workers, especially when applied to an exposure dosimeter. In addition to ensuring reliable management, this can be manufactured at low cost since it can be constructed by providing an operator insertion hole in a general switch cover member.

[Brief explanation of drawings]

FIG. 1 is a block diagram of essential parts of a device showing an embodiment of the present invention, FIG. 2 is a plan view of a meter equipped with the same device, and FIG. 3 is a block diagram of a conventional device. 1...Casing 3...Power switch 5...Switch cover 6...Key insertion hole 7
...Key Applicant Orient Watch Co., Ltd. Agent Patent Attorney Nishikawa Kasumi Osamu) Tani Onibu

Claims (1)

[Claims] A switch cover member having a hole for inserting a switch opening/closing operator is fixed to the casing, and a power switch operated by the operator is arranged below the fixed position of the cover member. Switch mechanism of portable totalizer.