JP2011089727A - Cutout hole structure of plate material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent burrs when cutting connection parts between slit holes of a cutout hole to form an opening hole and enhance safety during installation work. <P>SOLUTION: In a plate material including the cutout hole in which the plurality of slit holes 7a-7d are bored beforehand along the contour shape of the opening hole 6 to be formed and an opening hole contour part 9 and an opening hole closing member 10 to be cut off are interconnected via the connection parts 8a-8d remaining between the slit holes 7a-7d, an edge of the slit hole is constituted as a guide for guiding a cutting edge of a tool cutting the connection part to an opening hole contour side corner part 11 at the edge. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cutout hole structure formed in advance at a position where an opening hole of a plate material is to be formed in an indoor unit of a ceiling-embedded air conditioner in which a main body is made of a plate material such as a sheet metal. .

  For example, in the case where the main body outer shell is made of a sheet material such as a sheet metal such as an indoor unit of a ceiling-embedded air conditioner, an opening hole to be used when installing a duct is required in the main body outer shell. Therefore, a cutout hole (cutout hole) is provided in advance at the duct attachment position in the outer shell of the main body.

  A conventional cut-out hole has, for example, a plurality of slit holes formed in advance along the contour shape of the opening hole to be formed, and the opening hole portion separated from the opening hole contour portion via a connecting portion remaining between the slit holes. It has a configuration in which the closing member is connected (for example, see Patent Document 1).

  Moreover, as another conventional cut-out hole structure, a plurality of slit holes formed so that the outer edge side follows the contour shape of the opening hole to be formed, a plurality of connecting portions formed between these slit holes, and these connections And a shearing part that is sheared so as to follow the contour shape with the part remaining (see, for example, Patent Document 2).

JP-A-55-92831 (FIG. 5) JP-A-7-206195 (FIG. 2)

  However, in the conventional cutout holes, the end shape of the adjacent slit hole sandwiching the connecting portion is formed in a semicircular shape, and the inner side and the outer side of the radial direction sandwiching the arc passing through the semicircular intermediate point are symmetrical. It has the shape of For this reason, when forming the opening hole by cutting the connecting portion between the slit holes with a tool such as a nipper, the semicircular R serves as a guide for the blade of the tool, and the distance between the connecting portions by the aligning action of the arc Is cut along an arc passing through a semicircular intermediate point at the end of the adjacent slit hole sandwiching the connecting portion. For this reason, a burr protruding toward the inside of the opening hole is formed at the cut portion. Since the corners of the burr shape are sharp, the burr may cause the operator to cut their hands during installation work.

  The technical problem of the present invention is to prevent the occurrence of burrs when cutting the connecting portion between the slit holes of the cutout hole to form the opening hole, and to improve the safety during the installation work. It is in.

  The cutout hole structure of the plate material according to the present invention has the following configuration. That is, a plurality of slit holes are formed in advance along the contour shape of the opening hole to be formed, and the opening hole contour portion and the opening hole blocking member separated from the opening hole are connected via the connecting portion remaining between the slit holes. In the plate member having the cutout hole, the end edge of the slit hole is configured as a guide for guiding the blade of the tool for cutting the connecting portion to the opening hole contour side corner portion at the end edge.

  In the cutout hole structure of the plate material according to the present invention, the end edge of the slit hole is configured as a guide for guiding the blade of the tool for cutting the connecting portion to the opening hole contour side corner portion at the end edge. When the opening hole closing member is separated from the hole contour portion, no burr is generated, and the safety during the installation work can be improved.

It is a perspective view which shows the external appearance which looked at the indoor unit of the ceiling embedded type air conditioner to which the cutout hole structure of the board | plate material which concerns on one embodiment of this invention was applied. It is a front view which shows the cutout hole structure of the board | plate material which concerns on one embodiment of this invention. It is a front view which shows the shape of the opening hole after cut | disconnecting an opening hole obstruction | occlusion member from the cutout hole structure of the board | plate material which concerns on one embodiment of this invention.

  FIG. 1 is a perspective view showing an external view of an indoor unit of a ceiling-embedded air conditioner to which a cut-out hole structure of a plate material according to an embodiment of the present invention is applied, and FIG. 2 shows its cut-out hole structure FIG. 3 is a front view showing the shape of the opening hole after the opening hole closing member is cut off from the cut-out hole structure.

  The indoor unit of the ceiling-embedded air conditioner to which the cut-out hole structure of the plate material of the present embodiment is applied has a plurality of holding bars 22 supported by being suspended from the ceiling via suspension members 21 as shown in FIG. A room in which a decorative panel 3 serving as a design surface on the indoor side is disposed on the bottom of a grid system ceiling in which a ceiling material 2 is fitted in a plurality of squares of 600 mm square formed by being incorporated in a lattice shape. The machine body 1 is embedded and installed. The indoor unit main body 1 has an outer wall composed of a sheet metal member 4, and a duct 5 is installed in the opening hole 6 of the duct mounting portion. The opening hole 6 is initially formed as a cut-out hole, and the opening hole closing member 10 covers most of the opening surface.

  The cut-out holes are preliminarily formed with a plurality of (here, four) slit holes 7a to 7d along the contour shape of the opening hole 6 (FIGS. 1 and 3) to be formed as shown in FIG. It has the structure where the opening hole outline part 9 and the opening hole obstruction | occlusion member 10 cut | disconnected from this were connected through the connection parts 8a-8d which remain | survived in the middle.

  Moreover, the edge part edge of each slit hole 7a-7d in a cutout hole is comprised as a guide which guides the blade of the tool which cut | disconnects each connection part 8a-8d to the opening hole outline side corner part 11 in the said edge part edge. Yes.

  That is, the opening hole contour side tangential width dimension C of each connecting portion 8a to 8d is set smaller than the opening hole closing member side tangential width dimension D of each connecting portion 8a to 8d, and the opening hole contour side corner is set. The slit width interval narrows in a wedge shape toward the portion 11, and the blade of the tool slides from the inner diameter side to the outer diameter side at the end edge of the slit hole and is guided to the opening hole contour side corner portion 11. As a result, the portion of the connecting portion having the shortest tangential width dimension can be the cut portion 12 overlapping the opening hole contour portion, and burrs are generated when the opening hole closing member 10 is separated from the opening hole contour portion 9. Therefore, safety during installation can be improved.

  Further, the shape (angles) E and F of the opening hole contour side corner portion 11 at the end edge of each slit hole 7a to 7d is set to a right angle or acute angle with respect to the tangent, and the opening hole closing member side corner at the end edge is formed. The shape of the portion 13 is an R shape. Thereby, R of the opening hole closing member side corner portion 13 becomes a guide for the tool blade, and the tool blade slides from the inner diameter side to the outer diameter side of the end edge of the slit hole, to the opening hole contour side corner portion 11. It has come to be guided. As a result, the portion of the connecting portion having the shortest tangential width dimension can be the cut portion 12 overlapping the opening hole contour portion, and burrs are generated when the opening hole closing member 10 is separated from the opening hole contour portion 9. Therefore, safety during installation can be improved.

  Here, (A) the opening hole contour side tangential width dimension C of the connecting portion is set to be smaller than the opening hole closing member side tangential width dimension D of the connecting portion, and (B) the opening hole contour side corner portion. The shape (angle) E, F of 11 is a right angle or acute angle with respect to the tangent line, and the shape of the opening hole closing member side corner portion 13 at the end edge is the R shape, and by the synergistic effect by (A) and (B) Although the example in which the guide function of the edge of the slit hole edge is reinforced is described as an example, it can be said that the intended purpose can be achieved even with the configuration of (A) only or the configuration of (B) only. Not too long.

  As an example of the cut-out hole structure in the present embodiment, when the plate thickness of the sheet metal member 4 that is the outline of the indoor unit body 1 is 0.6 mm, the opening hole contour portion of the connecting portion 8 remaining between the slit holes The side tangential width dimension C is 3 mm, the opening hole closing member side tangential width dimension D is 6 mm, and the angles E and F of the opening hole contour side corner portions 11 at the end edges of the slit holes 7a and 7b are 90 °, respectively. If the R shape of the opening hole closing member side corner portion 13 at the end edge of the slit holes 7a and 7b is 1.5 mm and the radial width G of the slit holes 7a and 7b is 3 mm, an opening hole that does not have a burr shape remains. 6 could be formed.

  DESCRIPTION OF SYMBOLS 1 Indoor unit main body, 2 Ceiling material, 3 Decorative panel, 4 Sheet metal member (sheet material), 5 Duct, 6 Open hole, 7a-7d Slit hole, 8a-8d Connection part, 9 Open hole outline part, 10 Open hole obstruction member , 11 Opening hole outline side corner part, 12 Cutting part, 13 Opening hole obstruction member side corner part, 21 Hanging tool, 22 Holding bar.

Claims (3)

A cut in which a plurality of slit holes are drilled in advance along the contour shape of the opening hole to be formed, and the opening hole contour portion and the opening hole blocking member to be separated therefrom are connected through a connecting portion remaining between the slit holes. In a plate material having an out hole,
A cut-out hole structure for a plate material, wherein the end edge of the slit hole is configured as a guide for guiding a blade of a tool for cutting the connecting portion to an opening hole contour side corner portion at the end edge.   The shape of the opening hole contour side corner portion at the end edge of the slit hole is a right angle or acute angle with respect to the tangent line, and the shape of the opening hole closing member side corner portion at the end edge is an R shape. The cut-out hole structure for a plate material according to claim 1.   3. The plate material according to claim 1, wherein an opening hole contour side tangential width dimension C of the connecting portion is set smaller than an opening hole closing member side tangential width dimension D of the connecting portion. Cut-out hole structure.

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