JPS6371682A - Column detector for wall - Google Patents

Abstract

PURPOSE:To accurately detect the center position of a column provided to the back part of a wall panel even if the column slants by providing a tilt detecting means which detects the tilt of the column to the moving direction of a casing. CONSTITUTION:A circuit board 31, a battery B, electrode plates 11a and 11b, etc., are stored in the casing 3. Pilot lamps 27a and 27b are arranged on a straight line passing a mark 32 provided to the center part on one edge of the front surface of the casing 3 and the electrode plates 11a and 11b are arranged on a straight line which is parallel to said straight line and along the back surface of the casing 3. If the column 2 slants to the moving direction of the casing 3 when the position of the column 2 is detected, either of the pilot lamps 27a and 27b illuminates earlier. Therefore, the slanting direction of the column 2 is known from the illumination positions of the pilot lamps 27a and 27b and the distance between the centers of both electrode plates 11a and 11b.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a method for attaching a wall panel such as plywood or gypsum board that forms a wall (including a ceiling) to a rim, a stud, Wall support detection device mI for detecting supports such as wild edges from the surface side of wall panels: Related 7 [Background technology] Generally, walls (including ceilings) are formed of wall panels such as plywood and plasterboard. If you want to mount a clock or chisel on the wall, or to mount lighting on the ceiling or wall, use the support provided at the back of the wall panel (studs, selvedges, sills, etc.) to mount the wall panel. It is necessary to find the pole and insert the nail or hook into the post. However, since the surface of the wall panel is generally finished by pasting a decorative sheet or painting, it is difficult to locate the support columns visually.

Therefore, a method is generally used in which the position of a support post is detected by tapping the surface of a wall panel with a hammer or the like and using the fact that the sound produced changes depending on the presence or absence of the support support. However, since the sound of gypsum board does not change much depending on the presence or absence of supports, it is difficult for only an experienced person to detect the supports using this method.

US patent Li09 is proposed to solve this problem.
A stud sensor disclosed in No. 9118 is known. This uses the fact that the dielectric constant changes depending on the presence or absence of a support at the back of the wall panel, and detects the support installed at the back of the wall panel based on changes in capacitance (stray capacitance). . That is, as shown in FIG. 18, a device equipped with an electrode plate 11 on one side of the casing 3 is moved along the surface of the wall panel 1 as shown by the arrow in FIG.
Changes in capacitance are detected by utilizing the fact that the electric field generated in the electrode plate 11 as shown in FIG. 16 changes with the change in dielectric constant. Here, e capacitance is the 17th
As shown in the figure, it changes so that it becomes maximum at the center position of the support column 2. Based on this principle, in the above-mentioned US patent, the display element 5 such as a light emitting diode is set to light up (indicated by a black circle in FIG. 16) when the capacitance is above a predetermined value. Therefore, in order to find the center position of the pillar 2 using this device, it is sufficient to mark the two points of the lighting start position and the lighting end position of the display element 5 with a pencil or the like, and then find the intermediate position of the image dot. It is. Generally, the pillar 2 runs horizontally or vertically, so it is sufficient to move the device horizontally or vertically to detect the pillar 2. However, as shown in FIGS. 19 and 20, the pillar 2
If it runs diagonally, the actual center line of the support 2 and the center M (vertical direction) detected by the device are different, so when you select an arbitrary point on the detected center line,
There is a problem that it deviates from the center line of the pillar 2.

[Object of the Invention] The present invention has been made in view of the above points, and its object is to maintain the center of the support even when the support provided at the back of the wall panel is tilted. An object of the present invention is to provide a wall support detection device capable of accurately detecting a position.

[Disclosure of the Invention 1 (Example 1) As shown in FIG. 1, basically a pair of electrodes @11. a, 11b, and a display section 13 equipped with indicator lamps 27a, 27b that turn on when the zero tolerance predetermined value detected by the electrode plates 11a, Ilb is exceeded.

The e-tolerance amount detection unit 12 sets the time constants of the tiSl and second monostable multivibrators 21a and 21b, the monostable multivibrator 22 for setting the reference time, and the monostable multivibrator 22 for setting the reference time. Reference time constant determining circuit 23, first monostable multivibrator 21a, and reference time setting monostable multivibrator 2
tJSl time difference detection circuit 24a outputs a pulse corresponding to the difference in pulse width between the output pulses of the second monostable multivibrator 21b and the reference time setting monostable multivibrator 22. A second time difference detection circuit 24 that outputs a pulse corresponding to the width difference.
b, and first and second integrating circuits 25a and 2 that integrate the output pulses of the respective time difference detection circuits 24a and 24b, respectively.
5b.

each? ! The X pole @ 5.1 at 11 b is connected to one end of each resistor Ra, Rb, and the other end of the resistor Ra, Rb is connected to each resistor Ra corresponding to the switch S electrode plate 11a, 11b.
, Rb constitute a time constant circuit of the first and second monostable multi-bi breaks 21a and 21b. Therefore, a pulse (Fig. 2 (C)) with a pulse width corresponding to the time constant (Fig. 2 (a)) due to the capacitance detected by each electrode plate 11m + 11b and the corresponding resistance Ra, Rb is generated.
is the first upper V second monostable multivibrator 21a,
It is obtained as the output of 21b. Furthermore, the monostable multi-by-break 22 for setting the reference time has a time constant WL set in advance by the reference time constant determination circuit 23 (Fig.
)) and outputs a pulse (FIG. 2(d)) with a pulse width corresponding to the pulse width. Here, the outputs of the first and second monostable multivibrators 21a and 21b are positive logic, and the output pulse of the monostable multivibrator 22 for setting the reference time is negative logic. In addition, the fall of the output of the monostable multivibrator 2ia, 21b of the first upstream ttS2 and the monostable multivibrator 2 for setting the reference time
It is set to occur at the same time as the rise of the second output. In each time difference detection circuit 24a, 24b, from the falling edge of the output of the monostable multivibrator 22 for setting the reference time, the first and second monostable multivibrator 2
A pulse (FIG. 2(e)) with a pulse width corresponding to the time difference between the rise of the outputs 1a*21b is output. The output of each time difference detection circuit 24 at 24 b is integrated by the corresponding integration circuits 25a and 25b, and becomes an output of a DC voltage (Fig. ff52 (f)) proportional to the pulse width. If the capacitance detected by llb is large, the time required for the output pulses of the first and ttS2 monostable multivibrators 21a and 21b to rise will be longer, so the pulse width of the output pulse of each time difference detection circuit 24a and 24b will be As a result, the output voltage V of each 8 yen circuit 25a+25b
becomes larger. In other words, each integrating circuit 25a, 2
The output voltage of 5b is higher at the position where pillar 2 is located.
The position becomes larger than the position without it. By the way, the reference time constant determining circuit 23 detects the electrode plate 11a in a place where there is no support 2.
The time constant is set to correspond to the time constant due to the capacitance of the wall panel 1 detected by wllb and the resistors Ra and Rb. Therefore, in a place where there is no pillar 2, the integrating circuit 2
The output voltage V of 5a and 25b is approximately O, and an appropriately large output voltage V can be obtained only where the pillar 2 is present.

Note that the reference time constant determining circuit 23 determines the electrode plates 11a, 11b and the resistance Ra at that time when the switch SW is turned on.
, Rb is automatically set to a time constant that is approximately equal to the time constant caused by , then move the device to post 2
It is now possible to detect the

The display section 13 displays the output voltage V of each integrating circuit 25a, 25b.
When the value exceeds a predetermined value, the corresponding display lamp 27
A pair of display circuits 26ay and 26b having appropriate threshold values are provided so that the display circuits 26a and 27b are lit.

Circuit board @31 with the circuit section configured as above mounted
, battery B 4-electrode plates 11a+11b, etc. are the
As shown in FIG. 3, indicator lamps 27a and 27b are disposed on the front surface of the casing 3, and the switch SW has a handle protruding from the gA surface of the casing 3. The indicator lamps 27a and 27b are arranged on a straight line passing through a marker 232 provided at the center of one side edge of the front surface of the casing 3.
Electrode plates 11a and llb are arranged on a straight line parallel to this straight line and along the back surface of the casing 3. Here, the straight line connecting the electrode plates 11a and llb and the display lamp 27
Although a and 27b are connected to be parallel to the straight line r, this is intended to make it easier to recognize intuitively, and it is not necessarily necessary to make them parallel.

However, with the casing 3 in contact with the wall panel 1, the projections of the mark 32 and the electrode plates 11a and Ilb onto the wall panel 1 are arranged in a straight line.

To detect the position of the support column 2, the casing 3 is moved in a direction perpendicular to the straight line on which the electrode plates 11a and 1.1b are arranged f! jJ is exhausted. Here, as shown in Figure 5(b) (
When two drops of old soup are applied to the second hot water girders 11a and 11b, the indicator lamps 27a and 27b will light up at the same time, so when the indicator lamps 27a and 27b light up at the same time, the It is confirmed that the central axis is perpendicular to the direction of movement of the casing 3. Therefore, in this case, it is sufficient to mark the lighting start position and lighting end position of the indicator lamps 27a and 27b, and set the midpoint between the two points as the center position of the support column 2. On the other hand, Fig. 5 (
) or as shown in FIG. 5(e), if the support column 2 is inclined with respect to the moving direction of the casing 3, one of the image display lamps 27a and 27b will light up first. Become. Therefore, each indicator lamp 27a, 27
b, α nail position and both electrode plates 11a.

If the distance between the centers of the pillars 11b is known, the direction of inclination of the support column 2 can be determined. That is, as shown in FIG. 5(a), when the upper indicator lamp 27a is lit first, a mark is made at the lighting position of each indicator lamp 27a, 27b, and the lower indicator lamp 27b is lit. Electrode plate 11a in the direction perpendicular to the moving direction of casing 3 from the position mark.

A straight line parallel to the central axis of the support column 2 can be obtained by drawing a point downward by a distance corresponding to the distance between the centers of the pillars 11b and connecting this point to the mark at the position where the upper indicator lamp 27a is lit. Therefore, if the casing 3 is moved in a direction perpendicular to this straight line, the casing 3 will be moved in a direction perpendicular to the central axis of the support 2, and the center position of the support 2 can be easily determined. It is.

(Embodiment 2) In this embodiment, as shown in FIG. 6 and FIG. It is installed. The rotary table 33 is attached to the front surface of the casing 3 by screws 34 perpendicular to the front surface of the casing 3, is braked by a leaf spring 35, and can be rotated left and right within a range of 90 degrees. With this configuration,
By rotating only the rotary table 33, the display lamp 27a,
If the lights 27b are adjusted to light up at the same time, the casing 3 can be moved in a fixed direction (horizontal direction), improving operability. In order to horizontally compare the center position of the support column 2 with this device, the image display lamps 27a, 2
7b are lit at the same time, mark the lighting start position and lighting end position, find the center point of both parts, and draw a straight line passing through this center point and perpendicular to the moving direction of the casing 3. The center point of the support column 2 can be found by finding the intersection of this and a straight line that passes through the center of rotation of the rotary table 33 (set at the center position of both electrode plates 11a and 11b) and is parallel to the moving direction of the casing 3. This is possible.

This center passes through α and both sides? The straight line in the direction connecting the Ii electrode plates 11a and 11b becomes the central axis of the support column 2.

(Embodiment 3) In the above embodiment, two electrode plates 11a and llb were provided, but as shown in Fig. fjS8 and Fig. The slide plate 36 is slid 311 along a slide groove 38 provided in a groove 37 in the casing 3 so that the handle 39 protrudes from the side surface of the casing 3. With this configuration, when the indicator lamp 27 is in the α-lit position, the handlebar 3
9 repeatedly to move the electrode plate 11, and if the indicator lamp 27 lights up at that position, it can be recognized that the support column 2 is not tilted.

(Embodiment 4) In this embodiment, the inclination angle of the support column 2 and the swing amplitude of the voltmeter are made to correspond to each other.

As shown in the 10th leap, the metropolitan electric capacity detection unit 12 of the first embodiment
Since it is the same as , the explanation will be omitted. The display section 13 includes a pair of display circuits 26a and 26b, including an image display circuit 26aw2.
The output of 6b is sent to the display lamp 2 via the two-man OR circuit 28.
7c. Therefore, when the output level of either one of the display circuits 26a, 26b becomes 'H', the display lamp 27'c lights up.

By the way, the outputs of the first and second monostable multivibrators 21a and 21b are sent to the frequency detection unit 14 at λhis7.
1 zeI l'k jl? I j4', silent i A I
+61s1=”:! UIL 4- A pair of frequency/M1 pressure conversion circuits 41a, 41 that convert the outputs of the rt ibrators 21a, 21b into voltages corresponding to the output frequencies.
b, and an image frequency/voltage conversion circuit 41a.

A division circuit 42 that calculates the ratio of the output voltages of the circuit 41b, a comparison circuit 43 that compares the output of the circuit 42 with a reference voltage,
i! It is comprised of a reference voltage generation circuit 44 for obtaining reference voltages for the FIW, circuit 42 and comparison circuit 43, and an analog display voltmeter 45 for displaying the output voltage of the comparison circuit 43. As shown in FIGS. 13 and 14, this circuit section is housed within the casing 3 with the voltmeter 45 exposed on the front surface of the casing 3.

However, the capacitance detected by the electrode plate 11awllb changes in proportion to the area that the electrode plates 11a and 11b cover the support 2, and the capacitance detected by the electrode plate 11awlb changes in proportion to the area that the electrode plates 11a and 11b span the support column 2.

If the straight line connecting 11b and the central axis of support 2 are parallel,
Since the areas covered by both electrode plates 11a and llb on support column 2 are equal, the output waveforms of both vehicle stabilizing multi-vib breaks 21a and 21b are equal, as shown in FIG. 11, and as a result, both frequency dispersion/voltage conversion circuits 41a , 41b output voltage V
a and V b become equal. That is, the output Vx (reference voltage XVa/Vb) of the 'M correction circuit 42 becomes equal to the reference voltage, and the output voltage of the comparator circuit 43 becomes a preset voltage value (usually set to 0). In other words, the voltmeter 45 indicates the zero point. On the other hand, when the support column 2 is tilted, the areas applied to both the electrode plates 11a and llb are different, so as shown in FIG. /Output voltage V of voltage conversion circuits 41a and 41b
at V b have different values. Therefore, there will be a difference between the output voltage Vx of the m calculation circuit 42 and the reference voltage, the voltmeter 45 will swing either positive or negative from the zero point, and the inclination of the pillar 2 can be determined.

It's a good thing. Here, if the scale of the voltmeter 45 is made to correspond to the inclination angle of the support column 2, it is possible to know the inclination angle of the support column 2 just by reading the scale at the position where the indicator lamp 27C is lit. . In FIGS. 11 and 12, symbols (,) to (e) represent signals of corresponding parts in FIG. 10.

[Effects of the Invention] As described above, the present invention provides a pillar detection device that detects a pillar provided at the back of a wall panel by placing an electrode plate facing the surface of the wall panel and detecting a change in capacitance.
This device is equipped with an inclination detection means that detects the inclination of the support column with respect to the moving direction of the casing, and since the inclination of the support support can be detected, even if the support support is inclined, the position inside the support can be accurately detected. This prevents nails and the like from being driven into areas where there are no supports when nails are driven into the wall panel.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing Embodiment 1 of the present invention, Fig. 2 is an operation explanatory diagram showing signals of each part in Fig. 1, Fig. 3 is an external perspective view of the same as above, and Fig. 4 is a longitudinal section of the same as above. A top view, FIG.
A sectional view, FIG. 7 is an explanatory diagram of the same operation as above, and FIG. 8 is a block diagram showing a fourth embodiment of the am invention showing a third embodiment of the present invention.
11 and 12 are operational explanatory diagrams showing the signals of each part in FIG. 10, FIG. 13 is an external perspective view of the same, FIG. 14 is a vertical cross-sectional view of the same, and tPJ15 is a strut according to the present invention. A perspective view showing how to operate the detection device, FIGS. 16 and 17 are explanatory views of the same operation as above, and FIG. 18 is a partial perspective view of a conventional example.
FIGS. 19 and 20 are diagrams for explaining the above problem. 1 is a wall panel, 2 is a column, 3 is a casing, 11, Il
i and llb are electrode plates, 27.27a to 27c are indicator lamps, and 45 is a voltmeter. Agent Patent Attorney Ishi 1) 议 7 2 11-go[-m- 3 6 7 8 9 (o) (b) 11 (b) (C) (d) (e) Fig. 13 Fig. 14 Fig. 19 2 Fig. 20 (0) (b) Fig. 15 to I Fig. 17 Saigongu Fig. 16 Fig. 18 Fig. 411 徨 1

Claims (5)

[Claims] (1) In a pillar detection device that detects a pillar installed at the back of a wall panel by placing an electrode plate facing the surface of the wall panel and detecting changes in capacitance, the tilt of the pillar with respect to the direction of movement of the casing is detected. What is claimed is: 1. A wall support detecting device, comprising: an inclination detecting means for detecting inclination; (2) A patent characterized in that the above-mentioned inclination detection means is constituted by a pair of electrode plates and display means for respectively indicating that the capacitance detected by both electrode plates has exceeded a predetermined value. A wall support detection device according to claim 1. (3) The inclination detection means is composed of an electrode plate slidably disposed on the casing, and a display means for displaying that the capacitance detected by the electrode plate has exceeded a predetermined value. A wall support detection device according to claim 1, characterized in that the device comprises: (4) The above-mentioned inclination detection means is composed of a pair of electrode plates and a display means each indicating that the capacitance detected by both electrode plates has exceeded a predetermined value, and both electrode plates are connected to the casing. The wall support detection device according to claim 1, wherein the wall support detection device is arranged to be rotatable in a plane parallel to the wall surface. (5) Claims characterized in that the above-mentioned inclination detection means is constituted by a pair of electrode plates and an indicating means for indicating a value corresponding to the ratio of capacitance detected by both electrode plates. The wall support detection device according to paragraph 1.