JPH0746142B2 - Prop detector - Google Patents

Description

Detailed Description of the Invention

【Technical field】

The present invention relates to a pillar detection device for detecting a pillar, a stud, a furrow, etc. hidden behind a wall or a ceiling by measuring a change in dielectric constant.

[Background technology]

When mounting a clock or forehead on a wall, or when mounting a lighting fixture on a ceiling or a wall, search for a pillar (including studs, furrows, rims, etc.) behind the wall or ceiling, and attach a nail or hook to this pillar. There is a problem in strength unless it is driven. However, it is extremely difficult to identify the position of the pillars today, when many of the walls and ceilings are surface-finished. It is also possible to detect the presence of a post behind it by the sound of hitting the wall with a hammer, but the gypsum board system produces a small change in the sound on walls and ceilings that are the mainstream, which is a skill If you didn't do it, you wouldn't be able to find the position of the pillar. For this reason, in recent years, a detection device has been provided that detects the position of a pillar by utilizing the fact that the dielectric constant differs depending on whether or not the pillar is behind the wall. This is to generate an electric field by an electrode plate that moves along a wall, to detect a change in permittivity as a change in electrostatic capacity by the electrode plate, and if there is a change in electrostatic capacity, determine that there is a column at that position. FIG. 12 and FIG. 13 show conventional examples. An electrode plate 2, a detection circuit, a power supply, etc. are housed in a thin rectangular parallelepiped housing 1, and a switch 3 is arranged on the side surface of the housing 1, and this is displayed when a pillar is behind the wall on the surface. The light-emitting display means 4 is provided for this purpose. In the figure, 5 is a substrate on which the detection circuit is mounted. In this detection device, first, while pressing the switch 3 in a place where it seems that there is no support, the wall 6
To determine the reference capacitance, and then move along the wall 6 while keeping the switch 3 pressed,
The change in the electrostatic capacitance during this period is measured, and when the amount of change is equal to or larger than a predetermined value, the light emitting display means 4 is turned on to display that the column 7 is present at that position. Here, in the conventional detection device, since the housing containing the electrode plate is directly covered and held by hand, the change in the detected capacitance is affected by the capacitance of this hand. The amount is relatively small, the detection ability of the support column is reduced, and the capacitance change caused by the movement of the hand holding the housing causes a malfunction.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a strut detecting device capable of accurately detecting a strut without being affected by the hand.

DISCLOSURE OF THE INVENTION

Therefore, the present invention is provided with an electrode plate and a detection circuit for detecting the capacitance, and a switch for controlling the operation of these, and detects the change in the capacitance by the electrode plate facing the wall surface to detect the change in the wall. In a strut detecting device for detecting a strut behind the device, a measuring section for accommodating an electrode plate and a switch for gripping and operable at the time of gripping are arranged in a housing in which the above-mentioned members are arranged. The grip portion is provided, and the measurement portion is arranged at a position different from the portion between the both side surfaces of the grip portion by projecting the other from one of the measurement portion and the grip portion, This is to reduce the influence of the capacitance of the hand holding the housing. The present invention will be described in detail below with reference to the illustrated embodiments.
1 and 2 show the first embodiment, in which the housing 1
Is composed of a thin rectangular parallelepiped measuring part 10 and a grip part 11 protruding from the surface of the measuring part 10. The electrode plate 2 and the substrate 5 on which the detection circuit is mounted are housed in the measuring part 10. Then
The operation control switch 3, which is a power switch for the electrode plate 2 and the detection circuit, is installed on the side surface of the grip 11 rising from the surface of the measurement unit 10. The light emitting display means 4 for indicating that the capacitance has changed is provided on the surface of the measuring unit 10. Since the hand holding the housing 1 by pinching the grip portion 11 is separated from the electrode plate 2 installed in the measuring unit 10, the influence of this hand does not appear in the electrostatic capacitance detected by the electrode plate 2. Almost never. 3 to 5 show the second embodiment. Here, a pair of openable and closable covers 12 and 12 for covering the measuring unit 10 are provided, and the grip unit 11 is formed by the both covers 12 and 12 opened back to back. The switch 3 is installed on the inner surface of one cover 12. In the figure, reference numeral 13 is a recess for accommodating the switch 3 when the covers 12 and 12 are closed, 8 is a battery as a power source, and 20 is a lead wire connecting the substrate 5 and the switch 3. Although the grip portion 11 is provided, it has the same size as that shown as the conventional example when it is not used. Further, as is clear from FIG. 5, the covers 12, 12 are provided on one end side in the longitudinal direction of the measuring section 10 in the housing 1, and the electrode plate 2 is provided on the other end side of the measuring section 10, so that the grip section is provided.
The distance between 11 and the electrode plate 2 is made larger. A third embodiment is shown in FIGS. 6 to 8. The housing 1 has a rectangular shape and contains a battery 8 and a substrate 5, and a grip portion 11 on the side of which a switch 3 is arranged, and a measuring portion 10 that can be pulled out from one end of the grip portion 11. At the time of measurement, the measuring portion 10 accommodating the electrode plate 2 is pulled out from the grip portion 11 and the electrode plate 2 is separated from the grip portion 11. In this case, by providing a power switch that is opened / closed according to the insertion / removal of the measuring unit 10, it is possible to prevent unnecessary battery consumption when not in use. On the contrary, in the fourth embodiment shown in FIG. 9 to FIG.
The grip portion 11 can be freely pulled out from the measuring portion 10 having the built-in. If the grip part 11 is stored in the measuring part 10,
The switch 3 is not operated by mistake, and it is possible to prevent unnecessary battery consumption. The switch 3 can be automatically turned on / off when the grip portion 11 is pulled out. It should be noted that one end of the grip portion 11 on the pull-out side has a measuring portion 10 when the measuring portion 10 is pressed against the wall surface.
That is, in order to prevent the electrode plate 2 from tilting, the protrusion 16 that is flush with the contact surface of the measuring unit 10 with the wall surface is provided.

【The invention's effect】

As described above, in the present invention, the measuring section for accommodating the electrode plate and the grip section for gripping and in which the switch is arranged at a position operable at the time of gripping are provided, and the measuring section and the grip section are Since the measuring part is placed at a position different from the part between both sides of the grip part by projecting the other from one side, the influence of the hand holding the grip part and operating the switch can be detected by the electrode plate. It hardly shows up in the electrostatic capacity, and accurate column detection can be performed.

[Brief description of drawings]

FIG. 1 is a perspective view of the first embodiment of the present invention, FIG. 2 is a transverse sectional view of the same as above, and FIGS. 3 and 4 are perspective views of the second embodiment.
The drawing is a vertical sectional view of the same as above, FIGS. 6 and 7 are perspective views of a third embodiment, FIG. 8 is a vertical sectional view of the same as above, and FIGS. 9 and 10 are perspective views of a fourth embodiment. FIG. 11 is a vertical sectional view of the same as above, FIG. 12 is a perspective view of a conventional example, and FIG. 13 is a horizontal sectional view of the same as above. 1 is a housing, 2 is an electrode plate, 3 is a switch, and 10 is a measuring unit. , 11 are grip parts.

Claims (2)

[Claims] 1. An electrode plate and a detection circuit for detecting an electrostatic capacity, and a switch for controlling the operation of these electrodes. An electrode plate facing a wall surface detects a change in the electrostatic capacity and detects a change in the wall surface. In a strut detecting device for detecting a strut behind, a measuring section for accommodating an electrode plate and a grip for grabbing and a switch arranged at an operable position at the time of grasping are provided in a housing in which each of the above-mentioned members is disposed. And a measurement unit and a grip unit, and the other is projected from one of the measurement unit and the grip unit, and the measurement unit is arranged at a position different from a portion between both side surfaces of the grip unit. 2. The strut detecting device according to claim 1, wherein the measuring portion and the grip portion can be pulled out from one side to the other side.