Fixing pedestal for a through hole and device of fixing pedestal

Abstract

To provide a fixing pedestal for a through hole and a device of fixing pedestal which, when fixing an installation body for installing equipment on a ceiling wall or the like by driving a fastener such as a screw or a nail into a fixing pedestal body, can be driven in avoiding interference with a clamping part behind a wall.SOLUTION: Through-hole fixing pedestal and device of fixing pedestal include a fixing pedestal main body B that functions as a wall surface clamping part to be placed on the periphery of a through-hole H in a ceiling wall W and as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on a wall material, and a wall back clamping plate P that is inserted into the through-hole H from the wall surface and placed on the back side of the wall, and clamps the periphery of the through-hole H in cooperation with the fixing pedestal main body B. A display unit 12 is provided on the surface of the fixing pedestal main body B, the display unit 12 displays the position of the wall back clamping plate P when the periphery of the through-hole H is clamped between the fixing pedestal main body B and the wall back clamping plate P.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a through-hole fixing base and fixing base device for fixing an installation object such as equipment to a wall material such as a ceiling wall by covering the through-hole formed in the wall material. [Background technology]

[0002] A known cover device for concealing a through-hole in a wall material is disclosed in Patent Document 1. This cover device clamps the peripheral edge of a through-hole formed in the wall material with a pair of ceiling wall clamps A1 and A2 arranged on the front and back of the wall material, and a cover body K that covers the through-hole is attached integrally to the ceiling wall clamp A1 on the front side of the wall with an engaging structure.

[0003] The cover body K is also used as a component for fixing equipment to a ceiling wall or the like using tapping screws, but the positions of the ceiling wall clamps A1, A2 cannot be recognized because the cover body K covers not only the ceiling wall clamp A1 located on the back side of the wall but also the ceiling wall clamp A2 located on the front side of the wall. For this reason, depending on the position of the tapping screws driven into the cover body K, they may interfere with the ceiling wall clamps A1, A2, requiring them to be driven again. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-119334 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has an object to provide a fixing structure in which the periphery of a through-hole is clamped between a fixed base body that is placed on the surface of a wall to block the through-hole and a wall-back clamping portion that is placed on the back of the wall, such that when an installation body for installing equipment on a ceiling wall or the like is fixed by driving a fastener such as a screw or nail into the fixed base body, the installation body can be driven in without interfering with the wall-back clamping portion. [Means for solving the problem]

[0006] The invention of claim 1 to solve the above problem is: a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; The surface of the fixed base body is characterized by having a display portion that displays the position of the wall-back clamping portion when the fixed base body and the wall-back clamping portion clamp the peripheral portion of the through hole.

[0007] According to the invention of claim 1, the surface of the fixed base body is provided with an indicator that clearly indicates the presence of the wall-back clamping portion on the back side of the wall, so that by hammering an adhesive for fastening an installation object into the part of the fixed base body excluding the indicator, the installation object can be fastened to the surface of the fixed base body without interfering with the wall-back clamping portion on the back side of the wall. As a result, the hammered-in adhesive does not interfere with the wall-back clamping portion on the back side of the wall, eliminating the need to re-hammer it in, and improving the efficiency of the work of fastening the installation object to the fixed base body. Furthermore, the presence of the display section enables the installer to know that there is a back-wall clamping section behind the display section, and therefore, as described above, not only can the installer select a section of the fixed base body excluding the display section and drive in the adhesive, but if it is difficult or impossible to select a section excluding the display section, interference with the back-wall clamping section behind the wall can be avoided by selecting a shorter adhesive, and the intuitively understandable display section can also be said to alert the installer as to the position to drive in the adhesive, the type of adhesive to select, etc., and contributes to expanding the installer's range of choices for driving in multiple adhesives to avoid interference with the back-wall clamping section behind the wall.

[0008] The invention of claim 2 is characterized in that in the invention of claim 1, the display unit displays an area wider than the entire back-of-wall clamping unit.

[0009] According to the invention of claim 2, even if the fixing body is driven into a part of the fixed base body close to the display unit, it does not interfere with the wall-back clamping portion behind the wall, so the fixing body can be driven in reliably to fix the installation body to the fixed base body.

[0010] The invention of claim 3 is characterized in that in the invention of claim 1 or 2, the display section is formed to have a thickness different from that of other parts of the fixing base body.

[0011] According to the invention of claim 3, there is a difference in thickness between the display section on the surface of the fixing base body that prohibits the hammering of the adhesive and the area other than the display section, and this difference in thickness allows the user to intuitively understand the area where the hammering of the adhesive is prohibited. The display section has a recessed or protruding section that has the same shape as the wall clamping section, so that the location of the display section on the fixing base body can be more reliably recognized by both the difference in thickness and the shape of the wall clamping section.

[0012] The invention of claim 4 is as follows: a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; The fixing portion is characterized in that it is arranged only at a position that does not overlap with the wall back clamping portion that clamps the peripheral portion of the through hole from behind the wall in the driving direction of the fixing body.

[0013] According to the invention of claim 4, the fastening portion into which the fastener is driven is often pre-drilled with a large number of screw holes or pilot holes to facilitate the driving of screws as fasteners, and the presence of a large number of screw holes or pilot holes indicates that there is no back-wall clamping portion on the back side. Conversely, it indicates that there is a back-wall clamping portion on the back side of the wall in all or part of the portion where there are no large number of screw holes or pilot holes.

[0014] The invention of claim 5 is as follows: a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; The surface of the fixed base body is characterized by displaying a driving-in allowable area that is a position that does not overlap with the wall-back clamping portion that clamps the peripheral portion of the through hole from behind the wall, and / or a driving-in avoidance area that avoids driving in the adhesive, including a position that overlaps with the wall-back clamping portion.

[0015] In a structure in which the through-hole of the wall material is covered by the fixing base body, the "driving-avoided area" that prevents the driving of the adhesive is a wider area than the area where the wall back clamping part is located on the back side of the wall, and is all the remaining area excluding the "driving-permitted area." Therefore, in the invention of claim 5, by clearly indicating both the "driving-permitted area" and the "driving-avoided area," it is possible to drive the adhesive only into the "driving-permitted area."

[0016] The invention of claim 6 is characterized in that in the invention of claim 5, the driving-avoidance area includes a portion that covers the through-hole in the fixing base body from the front wall side.

[0017] According to the invention of claim 6, even if there is no wall-back clamping portion on the opposite side, if the length of the fixing body is relatively long compared to the fixing body, the part covering the through hole in the fixing base body from the front side of the wall will have the tip of the fixing body protrude behind the wall, and sufficient fixing strength will not be obtained. Therefore, a normal-sized installation body can be stably fixed by hammering the fixing body into the ``driving-in allowable area'' excluding the through hole in the fixing base body.

[0018] The invention of claim 7 is as follows: a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; a fastener that is driven into the fastening portion to fasten the installation body; It consists of The fixing portion is characterized in that the distance from the wall surface of the surface of the overlapping portion that overlaps with at least the wall-back clamping portion is longer than the length of the fixing body that is driven into the overlapping portion in the direction in which the fixing body is driven into the overlapping portion.

[0019] According to the invention of claim 7, the distance between the surface of the overlapping portion corresponding to the wall-back clamping portion in the fixing portion of the fixed base body and the wall surface (wall thickness of the fixed base body) is longer than the length of the fixing body to be driven into the overlapping portion, and functions as a "driving-in allowable area" despite the presence of the wall-back clamping portion behind the wall. Therefore, all remaining parts covering the through-holes in the fixed base body can be made into the "driving-in allowable area," and the driving-in allowable range of the surface of the fixed base body can be widened.

[0020] The invention of claim 8 is as follows: a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; a fastener that is driven into the fastening portion to fasten the installation body; It consists of The wall-back clamping portion is characterized in that it has a recess at a location located at the end of the driving direction of the fastener when it cooperates with the fixed base body to clamp the periphery of the through hole.

[0021] According to the invention of claim 8, even if the fastener driven into the fastening portion of the fixing base body penetrates the fixing base body and the wall material and reaches the recessed portion of the wall clamping portion, the wall clamping portion and the fastener do not interfere with each other. Therefore, the fixing portion of the fixing base body has a reduced area where driving is avoided, and the flexibility of the fastener driving operation is increased. [Effects of the Invention]

[0022] According to the present invention, the surface of the fixed base body is provided with an indicator that clearly indicates the presence of the back-wall clamp on the back side of the wall, so that by driving an adhesive for fixing the installation object into the part of the fixed base body excluding the indicator or by using an adhesive of short length, the installation object can be fixed to the surface of the fixed base body without interfering with the back-wall clamp on the back side of the wall. As a result, the hammered-in adhesive does not interfere with the back-wall clamp on the back side of the wall, eliminating the need to re-drive it, and improving the efficiency of the work of fixing the installation object to the fixed base body. [Brief explanation of the drawings]

[0023] [Figure 1] This is a partially broken oblique view seen from behind the ceiling wall W, showing a communication unit U attached to the main body B of the fixed base V of the present invention attached to the ceiling wall W via a support bracket 71. [Figure 2] FIG. [Figure 3] This figure shows that the positioning of a pair of screws 70 that fix a support bracket 71 to a fixed base body B attached to a ceiling wall W is within the driving allowable area 16 of the fixed base body B. [Figure 4] 10(a) and 10(b) are perspective views of the fixed base V as seen from the side of the pair of wall rear clamping plates P and the front side of the fixed base main body B, respectively. [Figure 5] 1(a) and 1(b) are perspective views showing the state in which a pair of wall rear clamping plates P are spread apart from each other by the rotation of a pair of pulling bolts 10 from the front side of the wall, and then pulled toward the fixed base body B. [Figure 6] 1(a) and 1(b) are a front view and a rear view of the fixed base V, respectively. [Figure 7] 6(a) and (b) are cross-sectional views taken along the lines X1-X1 and X2-X2 in FIG. 6(b), respectively. [Figure 8] (a) and (b) are perspective views of the wall back clamping plate P viewed from different directions, (c) is a front view of the same, and (d) to (f) are cross-sectional views taken along lines Y1-Y1 to Y3-Y3 in (c), respectively. [Figure 9]1 is a perspective view of the state before the rear-wall insertion portion 11 of the fixed base V is inserted into the through-hole H of the ceiling wall W from the front side of the wall. [Figure 10] 10(a) and 10(b) are partially cutaway perspective views of the state after the wall-back insertion portion 11 has been inserted, as seen from the back side and the front side of the wall, respectively. [Figure 11] 1(a) is a view from the back side of the wall showing the state in which the fixing base V is fixed in the through-hole H of the ceiling wall W, and FIG. 1(b) is a cross-sectional view taken along line ZZ of FIG. [Figure 12] FIG. 2 is a front view of the fixed base body B. [Figure 13] 10(a) and 10(b) are front views showing modified examples of the driving allowance region 16 of the fixed base body B. FIG. [Figure 14] FIG. 10 is a perspective view of a fixed base V' equipped with a fixed base body B'. [Figure 15] (a) is an oblique view of another example of a wall-back clamping plate P' to be placed behind the wall, and (b) is a cross-sectional view of line SS of (a) in which a fixed base V is fixed to a through hole H in a ceiling wall W. DETAILED DESCRIPTION OF THE INVENTION

[0024] The present invention will be described in more detail below with reference to the best embodiment. The fixed base V is attached to a ceiling wall W using a through-hole H in the ceiling wall W, and as shown in Figures 1 to 8, the fixed base V is composed of a fixed base main body B disposed on the front surface of the ceiling wall W, and a pair of wall-back clamping plates P partially threadedly engaged with a pair of pulling bolts 10 rotatably inserted into the fixed base main body B from the front surface side toward the back surface side, and pulled toward the fixed base main body B by the rotation of the pulling bolts 10 from the wall front side. The fixed base main body B and the wall-back clamping plates P are both formed by injection molding of resin. The fixed base body B is disk-shaped, and on its back side is formed a vertical fitting ring 1 that fits into a through-hole H in the ceiling wall W from the front side of the wall, perpendicular to and concentric with the fixed base body B, and inside the vertical fitting ring 1 is formed an inner parallel ring 2 that is parallel to the back side of the fixed base body B and protrudes slightly from the back side, and the circular hole in the inner parallel ring 2 forms a cable withdrawal hole 3 that withdraws cables 74 of various installation bodies (in this embodiment, a communication unit U) installed on the front side of the fixed base body B to the back side of the wall. In addition, a contact vertical ring 4 that abuts against the wall surface of the ceiling wall W is formed vertically on the peripheral edge of the back side of the fixed base body B.

[0025] Between the vertical fitting ring 1 and the inner parallel ring 2, which are concentrically formed on the back side of the fixed base body B, bolt support square tube sections 5 each having an irregular square shape for arranging and supporting the draw bolts 10 are formed perpendicular to the fixed base body B at two opposing locations along the diameter of the fixed base body B, and the base ends of the bolt support square tube sections 5 are formed to fit into the vertical fitting ring 1 and the inner parallel ring 2, thereby reinforcing the support strength of the base ends. The outer surface of the bolt support square tube section 5 constituting the square tube is arranged in the tangential direction of the vertical fitting ring 1, and the entire tube wall section constituting the outer surface is missing, forming a movement permitting opening 6 that permits the drawing movement of the wall back clamping plate P in the expanded position relative to the fixed base body B, and the tip opening of the square tube is closed by a draw bolt support plate 7. The base end support portions 31 at the base ends of a pair of roughly circular wall back clamping plates P that fit within the vertical fitting ring 1 in the converged arrangement state are inserted into the bolt support square tube portion 5 through insertion openings 5a1 (see FIGS. 1 and 5(a)) at the tip ends of the opposing cylindrical wall portions 5a of the bolt support square tube portion 5 at the maximum separation position of the pair of wall back clamping plates P from the fixed base body B. A pair of tension bolts 10 are inserted into the bolt support square tube portion 5 from the wall surface side, and their tip ends are rotatably supported by the tension bolt support plate 7, and the pair of tension bolts 10 are screwed into the base end support portions 31 of the pair of wall back clamping plates P. The insertion opening 5a1 is formed by cutting out the upper end of one of the pair of opposing cylindrical wall portions 5a, 5b that make up the bolt support square tube portion 5.

[0026] A bolt insertion hole 8 (see FIG. 7(a)) is formed in the portion of the fixed base body B on the back side where the pair of bolt support square tube portions 5 are arranged, and the inner half of the bolt insertion hole 8 is formed in a shape that allows the head 10a of a draw bolt 10 to be fixedly disposed therein. Therefore, when the draw bolt 10 is inserted from the bolt insertion hole 8 of the fixed base body B into the bolt support square tube portion 5 on the back side and the tip of the draw bolt 10 is supported by the draw bolt support plate 7 at the tip of the bolt support square tube portion 5, the draw bolt 10 is disposed and supported inside the bolt support square tube portion 5 so that it can be rotated from the front side of the fixed base body B. In addition, the base end support portions 31 of a pair of wall back clamping plates P, each having an approximately circular composite shape that fits within the vertical fitting ring 1 in a converged arrangement state, are partially inserted into the interior of each bolt support square tube portion 5 through each insertion opening 5a1 of each bolt support square tube portion 5 and screwed onto each pulling bolt 10, so that each wall back clamping plate P has its base end support portion 31 cantilevered on each pulling bolt 10.

[0027] As shown in Fig. 4, the pair of wall back clamping plates P supported in a convergent arrangement by the pair of drawing bolts 10 are identically shaped and arranged point-symmetrically with their first straight sides 32 abutting each other. That is, as shown in Figs. 4, 5, and 8, the wall back clamping plate P has an irregular shape in which one side of a triangle is curved outward, and is composed of three sides: a first straight side 32 that abuts against the other wall back clamping plate P in the convergent arrangement, a second straight side 33 that is connected to the first straight side 32 at an acute angle slightly smaller than a right angle, and curved sides 34 of the curved shape connected to the first and second straight sides 32, 33. A short plate-like base end support portion 31 that intersects with the first straight side 32 at an acute angle slightly smaller than a right angle is integrally formed at the intersection of the first straight side 32 and the curved side 34. The threaded hole of the base end support portion 31 is formed with a female thread portion 35 into which the pulling bolt 10 is threaded. The threaded engagement between the pulling bolt 10 and the female thread portion 35 of the base end support portion 31 of the wall back clamping plate P has a large threading resistance such that, when the wall back clamping plate P is in a free state, the wall back clamping plate P is rotated integrally by the rotation of the pulling bolt 10. A plurality of biting protrusions 36 are formed at predetermined intervals along a first straight edge 32 on the back surface of the wall back clamping plate P (the surface that abuts against the back surface of the ceiling wall W). By forming a plurality of biting protrusions 36, when the wall back clamping plate P cooperates with the fixed base body B to clamp the ceiling wall W, each biting protrusion 36 bites into the back surface of the wall material of the ceiling wall W, ensuring reliable clamping of the wall back side. 4, 5, 8, etc., reference numeral 37 denotes a reinforcing rib formed along the curved edge 34 on the surface of the wall rear clamping plate P in order to maintain the planar shape of the wall rear clamping plate P.

[0028] Therefore, as shown in Figure 9, when a pair of wall-back clamping plates P are placed in a convergent position, and the entire wall-back insertion portion 11 arranged inside the vertical fitting ring 1 on the wall-back side of the fixed base body B, including the pair of wall-back clamping plates P and a pair of bolt support square tube portions 5, is inserted into the through hole H formed in the ceiling wall W, and the vertical fitting ring 1 is fitted onto the inner surface of the through hole H, as shown in Figure 10(a), the wall-back insertion portion 11 is arranged on the wall-back side of the ceiling wall W. In this state, when the tip of the Phillips head screwdriver 50 is engaged with the head 10a of the pull bolt 10 from the front side of the wall and the pull bolt 10 is rotated, as described above, the threading resistance between the female thread portion 35 of the base end support portion 31 of the wall back clamping plate P and the pull bolt 10 is large, and the wall back clamping plate P, whose base end support portion 31 is inserted into the insertion opening 5a1 at the tip of the bolt support square tube portion 5, will rotate in unison with the pull bolt 10, with the pull bolt 10 as a fulcrum. 10(b), the side surface of the base end support portion 31 of the wall back clamping plate P abuts against the inner surface of another opposing cylindrical wall portion 5b that faces the opposing cylindrical wall portion 5a having the insertion opening 5a1 formed at its tip, preventing the combined rotation, and thereafter, with the rotation of the drawing bolt 10, the wall back clamping plate P is drawn toward the fixed base main body B and abuts against the back surface of the fixed base main body B. When the other wall back clamping plate P is similarly abutted against the back surface of the fixed base main body B, as shown in FIG. 11(a), the pair of wall back clamping plates P are arranged point symmetrically with respect to the center C of the through hole H with their respective first linear sides 32 approximately parallel to each other, and the ceiling wall W is clamped between the fixed base main body B on the wall front side and the pair of wall back clamping plates P on the wall back side, as shown in FIG. As a result, the fixing base V is fixed to the through hole H in the ceiling wall W.

[0029] In the convergent arrangement, the pair of wall-back clamping plates P have a large area that covers almost the entire through-hole H because their outer edges are closely aligned with the inner circumferential surface of the through-hole H in the ceiling wall W, and therefore, when they are spread apart behind the wall, there is an increased chance of interference with the screws 70, which are fasteners that are driven arbitrarily from the surface of the wall. For this reason, in the present invention, in order to avoid such interference, an indicator 12 is provided on the surface of the fixed base body B to alert the installer that a pair of wall-back clamping plates P are present behind the wall.

[0030] Various installation objects are installed on a fixed base body B that is fixed to a ceiling wall W using through holes H. In the illustrated example, as shown in Figs. 1 to 3, a square support bracket 71 is fixed to the fixed base body B with a pair of screws 70, and support protrusions 73 formed on the upper surface of a communication unit U are inserted into irregular elongated holes 72 formed at the four corners of the support bracket 71, and then the communication unit U is slid in the longitudinal direction of the irregular elongated holes 72, thereby hanging and supporting the communication unit U on the support bracket 71. The irregular elongated holes 72 are elongated holes that have portions that allow the support protrusions 73 to pass through and portions that do not allow the support protrusions 73 to pass through continuously in the longitudinal direction.

[0031] Here, a pair of wall-rear clamping plates P are disposed on the back surface of the ceiling wall W where the fixed base body B is located. Therefore, when fixing the support bracket 71 to the fixed base body B using a pair of screws 70, it is necessary to select a position that does not interfere with the pair of wall-rear clamping plates P on the back side of the wall. Therefore, in the present invention, as shown in FIG. 12 , an indicator 12 is formed on the surface of the fixed base body B to indicate the portion of the wall-rear clamping plates P located on the back side of the wall. The overall shape of the indicator 12 is shaped to include the entire wall-rear clamping plates P on the back side of the wall, thereby reliably avoiding interference between the screws 70 and the wall-rear clamping plates P on the back side of the wall. As shown in the figure, the indicator 12 is formed by displaying the outline of the overall shape with solid indicator lines 12a and 12b and by engraving warning text inside the lines that reads "Metal fittings on the back side, watch out for screws." However, other methods such as "texturing" or color identification are also possible. 12, a circular line 13 indicates the outline of a through hole H in a ceiling wall W, and heads 10a of a pair of pull bolts 10 are arranged close to the inside of the circular line 13, symmetrically about the center C of the through hole H. Cross lines 14 are formed in the direction connecting the pair of pull bolts 10 and in another direction perpendicular to that direction, to serve as a guide for the orientation of the installation body when installing it on the fixed base body B.

[0032] As a result, because there is no ceiling wall W behind the circular line 13, the area inside the circular line 13 constitutes part of the "drive-in avoidance area 15" that prevents the driving of screws 70. The remaining area on the surface of the fixed base body B, excluding the two "indicators 12" and the "drive-in avoidance area 15" within the circular line 13, constitutes the "drive-in allowance area 16." Therefore, the actual "drive-in avoidance area" is the sum of the "drive-in avoidance area 15" and the "indicators 12." By coloring only the two "drive-in allowance areas 16" and displaying the "warning text" on the two "indicators 12," workers can prevent misidentification of the screw-driving position during installation. If the two "indicators 12" are colored, the "drive-in allowance area 16" must be displayed in a different color. In each figure, the "drive-in allowance area 16" is distinguished from other areas by dots.

[0033] The screws 70, nails, and other fastening members for fastening the installation body to the fixed base body B are driven into the "driving-in permitted area 16," and therefore the "fastening portion" defined in claims 1, 4, 5, 7, and 8 can be regarded as the same as the "driving-in permitted area 16."

[0034] Furthermore, as shown in Figures 13(a) and (b), if a large number of elongated pilot holes 21 or a large number of circular pilot holes 22 are formed in advance in the driving-in allowance area 16 of the fixed base body B along the diameter direction, the trouble of finding the driving-in allowance area 16 during construction is eliminated, and the driving length of the screw 70 is shortened by the amount that the pilot holes 21, 22 are formed in advance, making it easy to drive the screw 70 without mistaking the driving position.

[0035] 1 to 3, particularly FIG. 3, when a square support bracket 71 is placed on a fixed base body B of a fixed base V fixed to a through-hole H in a ceiling wall W to install a communication unit U thereon, it is possible to instantly identify, among the many screw insertion holes 75 formed in the support bracket 71, which are to be located in the drive-permitted area 16 of the fixed base body B and the display unit 12. Therefore, by selecting a pair of screw insertion holes 75 that are present in the drive-permitted area 16 and are symmetrically arranged with respect to the center C of the through-hole H, and driving (threading) screws 70 into the pair of screw insertion holes 75, the support bracket 71 is fixed to the fixed base body B. Because the support bracket 71 is square, the orientation of the support bracket 71 relative to the fixed base body B can be determined by aligning one side of the support bracket 71 parallel to the cross line 14 formed on the fixed base body B. The method of attaching the communication unit U to the support bracket 71 is as described above.

[0036] Here, when installing an installation object such as a communication unit U via the fixed base V of the present invention in the portion of the through-hole H in a wall surface such as a ceiling wall W, there is a construction demand for the installation object to be as close to the wall surface as possible, and the easiest way to realize this demand is to make the plate thickness of the fixed base main body B that constitutes the fixed base V as small as possible. By making the plate thickness of the fixed base main body B small, there is a risk that fasteners such as the screws 70, nails, etc. will penetrate the wall material such as the ceiling wall W and protrude to the back side thereof, interfering with a back-wall clamping portion such as the back-wall clamping plate P that is present on the back side. Under these circumstances, the present invention has realized a way to reliably avoid interference with the back-wall clamping portion.

[0037] Furthermore, in the above description, the display unit 12 on the surface of the fixed base body B functions to display areas where the driving of adhesives is prohibited, but if it is impossible or difficult to drive adhesives into areas on the surface of the fixed base body B other than the display unit 12, interference with the wall-back clamping plate P can be avoided by selecting an adhesive of a length that does not interfere with the wall-back clamping plate P behind the wall. In this way, the display unit 12 provides the installer with information that a wall-back clamping plate P is present behind the wall, allowing the installer to select from a number of means for avoiding interference between the wall-back clamping plate P and the adhesive.

[0038] In addition, the fixed base body B' shown in Figure 14 has the advantage that the thickness of the driving-in allowable area 16 is thicker than the thickness of the display part 12, so that the driving-in allowable area 16 can be intuitively recognized without any mistaken identification due to the difference in thickness.

[0039] Furthermore, if the installation object to be installed on the fixed base body B is limited and the maximum length of the fastener such as a fastening screw is known in advance, by making the distance between the surface of the wall and the surface of the wall corresponding to the wall clamping part of the fixed base body (the plate thickness of the fixed base body) longer than the maximum length of the fastener to be driven into the overlapping part, the part behind the wall where the wall clamping part exists also functions as a "driving-in permitted part." Therefore, all remaining parts covering the through-holes in the fixed base body can be made into a "driving-in permitted area," and the driving-in permitted range of the surface of the fixed base body can be widened.

[0040] 15, if legs 38, 39 of the same height are formed on the back surfaces of the pair of wall back clamping plates P' along the first straight edge 32 and the curved edge 34, interference avoidance recesses 41 are formed between each wall back clamping plate P' and the ceiling wall W when the ceiling wall W is clamped between the fixed base body B on the front side of the wall and the pair of wall back clamping plates P'. This has the advantage that even if screws 70 are driven into the part of the fixed base body B where the pair of wall back clamping plates P' are arranged on the back side of the wall, there is no interference with the wall back clamping plates P'.

[0041] In the above embodiments, screws 70 are used as fasteners that are driven into the fixed base body B to fasten and install the installation body to the fixed base body B, but nails or the like may also be used. [Explanation of symbols]

[0042] B: Fixed base body H: Through hole P: Wall back clamping plate (wall back clamping part) U: Communication unit (installed body) V: Fixed base W: Ceiling wall (wall material) 12: Display section 15: Hitting avoidance area 16: Allowable range of impact 21: Long hole (allowable driving area) 22: Circular pilot hole (allowable driving area) 41: Interference avoidance recess

Claims

1. a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; A fixed base for a through hole, characterized in that a display portion is provided on the surface of the fixed base body to display the position of the wall-back clamping portion when the fixed base body and the wall-back clamping portion clamp the peripheral portion of the through hole.

2. The fixing base for a through hole according to claim 1 , wherein the display portion displays an area wider than the entire back-of-wall clamping portion.

3. 3. The fixing base for a through hole according to claim 1, wherein the display portion is formed to have a thickness different from that of other portions of the fixing base body.

4. a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; A fixed base for a through hole, characterized in that the fixing portion is arranged only in a position that does not overlap with the wall back clamping portion that clamps the peripheral portion of the through hole from behind the wall in the direction in which the fixing body is driven in.

5. a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; A fixed base for a through hole, characterized in that the surface of the fixed base body is marked with a driving-in allowable area that is a position that does not overlap with the wall-back clamping portion that clamps the peripheral portion of the through hole from behind the wall, and / or a driving-in avoidance area that avoids driving in the fixing body, including a position that overlaps with the wall-back clamping portion.

6. 6. The fixing base for a through hole according to claim 5, wherein the driving-avoiding area includes a portion of the fixing base body that covers the through hole from the wall surface side.

7. a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; a fastener that is driven into the fastening portion to fasten the installation body; It consists of A fixed base device characterized in that the distance from the wall surface of the surface of the overlapping portion of the fixing portion that overlaps with at least the wall-back clamping portion is longer than the length of the fixing body driven into the overlapping portion in the direction of driving the fixing body.

8. a fixed base body having a function as a wall surface clamping part to be placed on the periphery of the wall surface of a through hole formed in the wall material, and a function as a fixing part into which fixing bodies such as screws and nails are driven to fix an installation body such as equipment to be installed on the wall material; a wall back clamping portion that is inserted into the through hole from the wall surface and arranged on the wall back side, and clamps the peripheral portion of the through hole in cooperation with the wall surface clamping portion; a fastener that is driven into the fastening portion to fasten the installation body; It consists of A fixed base device characterized in that the wall-back clamping portion has a recess at a location located at the end of the driving direction of the fixing body when it cooperates with the fixed base body to clamp the periphery of the through hole.

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