JPS6355487A - Support detecting device - Google Patents

Abstract

PURPOSE:To exactly detect a support by providing a grip part separately from a measuring part in which an electrode plate has been contained, and providing a switch on this grip part. CONSTITUTION:A housing 1 consists of a rectangular parallelopiped-shaped measuring part 10 of a thin type, and a grip part 11 which has been provided projectingly from the surface of this measuring part 10, and a substrate 5 on which an electrode plate 2 and a detecting circuit have been mounted, etc. are contained in the measuring part 10. Also, an operation controlling switch 3 is installed to the side face of the grip part 11, and a light emission display means 4 for displaying a fact that the capacitance has been varied is provided on the surface of the measuring part 10. Accordingly, a hand for holding the housing so as to pinch the grip part 11 is separated from the electrode plate 2 which has been installed in the measuring part 10, therefore, an influence by this hand is scarcely exerted on the capacitance detected by the electrode plate 2, and a support can be detected exactly.

Description

[Detailed description of the invention] 【Technical field】

The present invention relates to a post detection device that detects posts, studs, rims, etc. hidden behind walls and ceilings by measuring changes in dielectric constant.

[Background technology]

When attaching a clock or frame to a wall, or when attaching a light fixture to a ceiling or wall, locate the support behind the wall or ceiling (including studs, trusses, edges, etc.) and attach nails or hooks to these supports. However, in today's world, where many walls and ceilings have a surface finish, it is extremely difficult to distinguish the position of the supports. By the sound of tapping,
It has also been possible to detect the presence of a support post behind it, but since plasterboard is the mainstream, the change in the sound produced is small, and it is difficult to find the position of the support support unless you are an experienced person. Can not. For this reason, in recent years, a detection device has been provided that detects the position of a post by utilizing the fact that the dielectric constant differs depending on whether there is a post behind the wall or not. This generates an electric field by moving an electrode plate along a wall, and the electrode plate detects changes in dielectric constant as changes in capacitance.If there is a change in capacitance, it is determined that there is a support at that location. Conventional examples are shown in FIGS. 12 and 13. An electrode plate 2, a detection circuit, a power supply, etc. are housed in a thin rectangular housing 1, and a switch 3 is placed on the side of the housing 1, and the switch 3 is displayed on the surface when there is a support behind a wall. A light emitting display means 4 is arranged for the purpose of displaying the image. In the figure, 5 is a board on which a detection circuit is mounted. In this detection device, first determine the reference capacitance by pressing the switch 3 against the wall 6 at a place where there is thought to be no support, then hold the switch 3 pressed and press it against the wall 6. The change in capacitance during this time is measured, and if the change exceeds a predetermined value, the light emitting display means 4 is turned on to indicate that the support post 7 is at that position. Here, in conventional detection devices, the housing containing the electrode plate is directly covered and held in the hand, so the effect of the capacitance caused by the hand can change the detected capacitance. This decreases the detection ability of the support column, and changes in capacitance caused by the movement of the hand holding the housing cause malfunctions.

[Purpose of the invention]

The present invention has been made in view of these points, and its purpose is to provide a support pillar detection device that can accurately detect the support pillars without being affected by the hand in which the support is held.

[Disclosure of the invention]

Therefore, the present invention is equipped with an electrode plate and a detection circuit for detecting capacitance, and a switch for controlling these operations, and detects changes in capacitance with the electrode plate facing the wall surface. In a support pillar detection device that detects a support support behind the housing, the housing in which the above-mentioned members are arranged is provided with a measurement part that accommodates an electrode plate and a grip part in which a switch is provided, and the measurement part and the grip part are connected to each other. The housing is characterized by being spaced apart to reduce the influence of capacitance caused by the hand holding the housing. The present invention will be described in detail below based on the illustrated embodiments.
Figures 1 and 2 show the first embodiment, in which the housing 1
is a thin rectangular parallelepiped-shaped measuring section 10, and this measuring section 10.
The electrode plate 2 and the substrate 5 on which the detection circuit is mounted are housed in the measurement unit 10, and the operation is a power switch for the electrode plate 2 and the detection circuit. The control switch 3' is installed on the side surface of the grip section 11 rising from the surface of the measuring section 10. Luminous display means 4 for indicating that there has been a change in capacitance
is provided on the surface of the measuring section 10. The hand holding the housing 1 by pinching the grip part 11 is far from the electrode plate 2 installed inside the measuring part 10, so this hand has an effect! It hardly appears in the capacitance detected at the electrode plate 2. 3 to 5 show a second embodiment. Here, a pair of covers 12 that cover the measuring section 10 can be opened and closed.
．． 12 is provided, and the double force bar 12. is opened back to back.
12 forms a grip portion 11. Note that the switch 3 is installed on the inner surface of one cover 12. In the figure, 13 is a Nissin in which the switch 3 is housed when the cover 12.12 is closed, 8 is a battery as a power source, and 20 is a lead wire connecting the board 5 and the switch 3. Although there is a grip portion 11, the size is the same as that shown as the conventional example when not in use. As is clear from FIG. 5, by providing the cover 12.1 i on one longitudinal end of the measuring section 10 in the housing 1 and the electrode plate 2 on the other end of the measuring section 10, The distance between the portion 11 and the electrode plate 2 is made larger. A third embodiment is shown in FIGS. 16 to 8. The housing 1 has a rectangular shape and houses an electric conductor A8 and a board 5, and has a grip part 11 with a switch 3 arranged on the side surface, and a measuring part 10 that can be pulled out from one end of the grip part 11.
At the time of measurement, the measuring part 10 containing the electrode plate 2 is pulled out from the grip part 11 to separate the electrode plate 2 from the grip part 11. By providing a power switch that depletes the battery, it is possible to prevent unnecessary battery consumption when not in use. In the fourth embodiment shown in FIGS. 9 to 11, on the contrary, the grip section 11 can be freely pulled out from the measurement section 10 in which the electrode plate 2 is incorporated. If the grip part 11 is stored in the measuring part 10, the switch 3 will not be operated with m (,
After all, unnecessary battery consumption can be prevented. The switch 3 can also be automatically turned on and off as the grip part 11 is pulled out. In addition, grip part 1
One end of the drawer side of 1 has a protrusion that is flush with the contact surface of the measuring section 10 against the wall surface so that the measuring section 10, that is, the electrode plate 2, does not tilt when the measuring section 10 is pressed against the wall surface. There are 16. [Effects of the Invention] As described above, in the present invention, a grip part is provided that is separated from the measurement part in which the electrode plate is housed, and a switch is provided in this grip part, so that the switch can be operated while holding the grip part. The influence of the moving hand hardly appears on the capacitance detected by the electrode plate, and accurate pillar detection can be performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the first embodiment of the present invention, FIG. 2 is a cross-sectional view of the same as above, FIGS. 3 and 4 are perspective views of the second embodiment, and FIG.
6 and 7 are perspective views of the third embodiment; FIG. 8 is a longitudinal sectional view of the same; FIGS. 9 and 10 are perspective views of the fourth embodiment; 11 is a longitudinal cross-sectional view of the same as above, FIG. 12 is a perspective view of the conventional example, and FIG. 13 is a cross-sectional view of the same as above, in which 1 is a housing, 2 is an electrode plate, 3 is a switch, 10 is a measuring section, 11 indicates a grip portion. Agent Patent Attorney Ishi 1) Ai 7F-+~So〇-

Claims (2)

[Claims] (1) Equipped with an electrode plate and a detection circuit for detecting capacitance, and a switch for controlling these operations, the change in capacitance is detected with the electrode plate facing the wall, and the detection circuit behind the wall is In a pillar detection device for detecting a pillar, a housing in which each of the above-mentioned members is arranged is provided with a measuring part that houses an electrode plate and a grip part in which a switch is provided, and the measuring part and the grip part are separated from each other. A pillar detection device characterized by: (2) Claim 1, characterized in that the measuring part and the grip part can be freely pulled out from one side to the other.
Post detection device as described in section.