JP2007174775A - Knockout structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a knockout structure capable of attaining ease of work at a knockout portion, minimizing scratches at a body for supporting a knockout portion at the time of removal work, and easily removing the knockout portion in the knockout structure in which the knockout portion is provided at the body so that a part of the knockout portion may be supported by the body and part of the body is inserted and provided by removing the knockout portion. <P>SOLUTION: In the knockout structure in which the knockout portion is provided at the body so that a part of the knockout portion may be supported by the body, and a part of the body is inserted and provided by removing the knockout portion, the knockout structure having a removal assisting device for assisting removal of the knockout portion at a part of the knockout structure is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a knockout structure in which a knockout part is supported by a part of a main body provided with a knockout structure, and a part of the main body is made to be pierced by removing the knockout part.

The knockout structure is known as means for making a part of the main body pierced by removing the knockout portion (see, for example, Patent Documents 1, 2, and 3).

As a general purpose of using the knockout structure, for example, a wire is drawn from the outside of the main body into the main body into a hole provided after the knockout portion is removed, or the wiring is drawn out from the inside of the main body toward the outside. It can be used as a wiring path.

Various materials such as a resin material and an iron material are used as a constituent material of the main body in which the knockout structure is used.

When a resin material is used as a constituent material of the main body, a knockout structure is usually provided in a part of a mold for molding the main body to form a knockout structure. In order to prevent the knockout part from being unnecessarily detached from the main body, a plurality of ribs are provided to connect the knockout part and the main body, and the knockout part is supported by the main body.

Further, when an iron material is used as the constituent material of the main body, the knockout structure is formed by stamping and forming approximately the thickness of the iron material so as to leave the support portion between the knockout portion and the main body. The knockout part is supported by the main body by the support part.

Japanese Patent Laid-Open No. 2004-64867 “0026” Japanese Patent Laying-Open No. 2004-64868 “0023” Japanese Patent Laid-Open No. 2004-64869 “0025”

As described above, the knockout structure is provided so that the knockout portion is partially supported by the main body. However, when the knockout portion is knocked (tapped) to be removed from the main body, if the hitting condition is not good. Sometimes it could not be removed from the body. In other words, it cannot be removed with a single knock, and it is necessary to knock several times. Therefore, workability may be reduced, and if the strike location is wrong, the main body may be scratched or dented.

In addition, for example, there is a case where the body is knocked after being mounted at a predetermined mounting position. However, depending on the position where the knockout structure is provided, it is difficult to knock, and as a result, it is difficult to remove the knockout part. .

In particular, in a knockout structure composed of iron material, the force required to remove the knockout part may increase due to variations during molding, so it must be knocked very strongly. There was a problem that the knockout part could not be easily removed, and a problem that if the wrong place was knocked because it knocked strongly, that place would be damaged or recessed.

Therefore, the present invention has been made in view of such problems,
In the knockout structure in which the knockout portion is provided to be supported in part by the main body, and by removing the knockout portion, the main body is partially drilled.
It is an object of the present invention to provide a knockout structure that is excellent in removal workability of the knockout part, can reduce damage to the main body supporting the knockout part as much as possible, and can easily remove the knockout part.

In order to achieve the above object, according to the first aspect of the present invention, a knockout structure is provided so that a part of the knockout part is supported on the main body, and a part of the main body is made in a perforated state by removing the knockout part. In
A knockout structure is provided in which a removal assisting means for assisting the removal of the knockout portion is provided in a part of the knockout structure.

According to such a configuration, when the knockout portion is removed, the removal workability of the knockout portion is good, the main body supporting the knockout portion is hardly damaged during the removal operation, and the knockout portion is easily removed. be able to.

In addition, the removal assist means of the knockout part is
You may comprise as a characteristic that it provided and provided the gap | interval partly between the main body and the knockout part.

Thereby, the removal workability of the knockout part is good, and it is possible to provide a knockout structure that can minimize the damage of the main body that supports the knockout part during the removal work and can easily remove the knockout part.

Further, the removal assisting means of the knockout part is:
You may comprise as a characteristic that the hole for tool insertion was provided in the knockout part.

As a result, when removing the knockout part, the knockout part can be removed by inserting the tool into the hole of the knockout part, so that the workability is better than when knocking many times. It is possible to provide a knockout structure capable of damaging the main body supporting the portion as much as possible and easily removing the knockout portion.

Further, the removal assisting means of the knockout part is:
A concave portion may be provided in a part of the knockout portion, and the gap may be formed between the main body and the knockout portion.

As a result, when the knockout part is removed, the tool can be removed by inserting the tool along a recess provided in a part of the knockout part, so that the knockout part can be removed. In comparison, the workability is good, and it is possible to provide a knockout structure that can minimize the damage to the main body that supports the knockout portion during the removal operation and can easily remove the knockout portion.

Further, the removal assisting means of the knockout part is:
A concave portion may be provided in a part of the main body so that a gap is formed between the main body and the knockout portion.

As a result, when removing the knockout part, the tool can be removed by inserting the tool along the recess provided in a part of the main body, so that the knockout part can be removed. Thus, it is possible to provide a knockout structure that has good workability, can minimize damage to the main body that supports the knockout portion during removal work, and can easily remove the knockout portion.

In addition, in the knockout structure that is provided so that a part of the knockout part is supported on the main body, and the part of the main body is made to be pierced by removing the knockout part,
At least two support members for supporting the knockout portion on the main body are provided. The arrangement portion of the first support member, the substantially central portion of the hole portion obtained by removing the knockout portion, and the second support member You may comprise as the characteristic that the arrangement | positioning part of the said supporting member was provided in the position where the angle which the line segment which each ties with an arrangement | positioning part becomes smaller than 180 degree | times.

As a result, since the support part between the knockout part and the main body is provided at a position deviated from the substantially central part, when the knockout part is knocked, a larger moment acts on the support part, and the number of times of knocking is reduced. It is possible to provide a knockout structure that can be reduced as much as possible, has good workability, can minimize damage to the main body that supports the knockout portion during removal work, and can easily remove the knockout portion.

You may comprise as a characteristic that the place to knock was described in the position deviated from the approximate center part of the hole obtained by removing the said knockout part.

As a result, the operator can apply a large moment to the support part more efficiently by knocking the place marked on the knockout part as a mark. It is possible to provide a knockout structure that can be reduced, has good workability, can reduce damage to the main body that supports the knockout portion as much as possible, and can easily remove the knockout portion.

At least two support members for supporting the knockout portion on the main body are provided. The arrangement portion of the first support member, the substantially central portion of the hole portion obtained by removing the knockout portion, and the second support member The removal that assists the removal of the knockout portion in a part of the knockout structure, wherein the placement portion of the support member is provided at a position where an angle formed by a line segment connecting each of the placement portions is smaller than 180 degrees. You may comprise the knockout structure which provided the auxiliary means.

As a result, when using the removal assisting means, a large moment can be applied to the support portion more efficiently, so workability is good and damage to the main body that supports the knockout portion during removal work can be minimized. In addition, a knockout structure capable of easily removing the knockout portion can be provided.

A removal that assists the removal of the knockout portion in a part of the knockout structure, characterized in that the location of the knockout is marked at a position deviated from the substantially central portion of the hole portion obtained by removing the knockout portion. You may comprise the knockout structure which provided the auxiliary means.

As a result, the knockout part can be removed in a manner that is easy for the operator to work by using the clearance, hole, and recess provided as a removal assisting means together with the use of the description of the place to knock. As a result, it is possible to provide a knockout structure that is excellent in workability, can minimize damage to the main body that supports the knockout portion during removal work, and can easily remove the knockout portion.

According to the present invention, in the knockout structure that is provided so that the knockout part is partially supported by the main body, and that a part of the main body is made to be pierced by removing the knockout part,
It is possible to provide a knockout structure in which the removal workability of the knockout part is good, the main body supporting the knockout part is hardly damaged during the removal work, and the knockout part can be easily removed.

Hereinafter, a knockout structure according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 to 18 show an embodiment of the knockout structure of the present invention. In FIG. 1, 1 shows an embodiment of a knockout structure, 2 is a main body having the knockout structure, 3 is a knockout portion removed from the main body, and 4 is a support for supporting the knockout portion on the main body. Parts 5 are removal assisting means used when removing the knockout part from the main body. In FIG. 2 and subsequent figures, the same reference numerals are the same as those described in FIG.

In the present embodiment, an example in which the constituent material of the main body 2 and the knockout portion 3 is a metal (particularly iron material) is shown. The shape of the main body 2 is a box structure (the figure shows a part of the main body), and by removing the knockout portion, a part of the main body 2 is made to be in a perforated state. Can be used, for example, as a wiring path. In the present embodiment, an example in which the shape of the drilled portion is a round hole is shown.

The knockout portion 3 is formed by punching about a plate thickness at a predetermined position where the knockout structure of the main body 2 is provided. During the punching process, the knockout part 3 is supported by the main body 2 by punching partly leaving the support part 4. In the present embodiment, the arrangement positions of the support portions 4 are shown as two locations in the diameter direction of the round holes in the drawing.

The removal assisting means 5 is provided by pressing so that a recess is provided in part at the peripheral edge of the knockout portion 3. The removal assisting means 5 is disposed in a direction perpendicular to the diameter direction in which the support portion 4 is provided, and is formed between the main body 2 and the knockout portion 3 by the concave portion provided by the press working. A part of the gap is formed. The size of the gap is set such that a tool can be inserted when the knockout portion 3 is removed.

Next, a method for removing the knockout portion 3 using the removal assisting means 5 will be described. Normally, when removing the knockout portion from the main body, the support portion 4 is broken by hitting (knocking) the substantially central portion of the knockout portion 3 with a tool or the like, and the knockout portion 3 is removed from the main body 2. In this embodiment, by inserting a tool into the gap provided as the removal assisting means 5 and turning it, the knockout portion 3 rotates with the support portion 4 provided in the diameter direction as a fulcrum. In this direction, the support portion can be easily broken and removed from the main body without hitting the knockout portion by rotating the support portion multiple times forward and backward with a tool or fingers.

In particular, as explained in the background art, when the main body is made of metal, the force of tapping to remove the knockout portion increases, so the number of times of tapping increases and the location of tapping is incorrect. Although there is a risk of scratching or denting the main body, in this embodiment, there is no need to strike when removing the knockout portion, so there is no risk of damaging the main body, and the support portion is easily broken. Therefore, the knockout part can be easily removed.

Next, as a second embodiment, FIG. 2 shows a diagram in which a round hole 5a for tool insertion is provided in the knockout portion 3 as the removal assisting means 5. FIG. The size of the round hole 5a is set such that a tool can be inserted when the knockout portion 3 is removed.

When the knockout part 3 is removed, a tool is inserted into the round hole 5a so that the knockout part 3 is rotated with the support part 4 provided in the diameter direction as a fulcrum. In this direction, the support portion can be easily broken and removed from the main body without hitting the knockout portion by rotating the support portion multiple times forward and backward with a tool or fingers.

Next, FIG. 3 shows, as a third embodiment, a configuration in which a square hole 5b for tool insertion is provided in the knockout portion 3 as the removal assisting means 5. The size of the square hole 5b is such that a tool can be inserted when the knockout portion 3 is removed.

When the knockout part 3 is removed, a tool is inserted into the square hole 5b so that the knockout part 3 is rotated with the support part 4 provided in the diameter direction as a fulcrum. In this direction, the support portion can be easily broken and removed from the main body without hitting the knockout portion by rotating the support portion multiple times forward and backward with a tool or fingers.

The shape of the hole may be configured by providing a main main shape such as an elliptical shape or a rhombus shape in addition to the round hole 5a and the square hole 5b.

Next, in FIG. 4, as a fourth embodiment, as the removal assisting means 5, a recess is formed in a part of the knockout part 3 by pressing so that a gap is provided between the main body 2 and the knockout part 3. Is shown in FIG. Since the concave portion is provided in a direction perpendicular to the diametric direction connecting the support portions 4, two gaps with the main body are formed in the diametric direction.

When removing the knockout part 3, the support part provided in the diametrical direction by inserting a tool or the like into the gap on the side where the work is easy to perform, depending on the attachment state of the main body or the work place of the operator. The knockout part 3 rotates about the fulcrum 4, and the support part can be easily broken without hitting the knockout part by rotating the knockout part three times forward and backward with a tool or fingers in the direction of the rotation. Can be removed from the body.

Next, as a fifth embodiment, FIG. 5 shows a main body and a knockout formed by pressing the main body 2 into the main body 2 at the peripheral edge of the knockout portion 3 as a removal assisting means 5. An example is shown in which a gap 5d is provided between each part.

When the knockout portion 3 is removed, a tool is inserted into the gap 5d so that the knockout portion 3 rotates with the support portion 4 provided in the diameter direction as a fulcrum. In the direction to be performed, the support portion can be easily broken and removed from the main body by hitting the knockout portion multiple times in the forward and reverse directions with a tool or fingers.

Next, in FIG. 6, as a sixth embodiment, support members 4 a that support the knockout portion 3 on the main body 2 are provided at two locations, and the arrangement portion of the first support member and the knockout portion 3 are removed. A knockout structure is configured by arranging the support member at a position where the angle formed by the line segment connecting the substantially central portion of the hole portion obtained by this and the arrangement portion of the second support member is smaller than 180 degrees. An example is shown.

Compared with the case where the support portion 4 is provided in the diametrical direction, in this embodiment, the support portion between the knockout portion and the main body is provided at a position deviated from the substantially central portion of the hole portion. For this reason, when the knockout part is knocked (struck), a larger moment acts on the support part than when the support part is provided in the diameter direction, and the force obtained by knocking is applied to the support part more efficiently. Can be added. Therefore, the number of times of knocking can be reduced as much as possible, the workability is good, the main body supporting the knockout part can be hardly damaged during the removal work, and the knockout part can be easily removed.

Next, in FIG. 7, as a seventh embodiment, in addition to the configuration of the sixth embodiment, a place where the knockout portion 3 is knocked at a position deviated from the substantially central portion of the hole portion formed by removing the knockout portion 3 is shown. The knockout structure comprised is described. As the description position 6 (knock position 6) of the knocking position, it is preferable to select and describe a position where the knocking force is effectively applied to the support portion and the main body is not easily damaged during knocking.

Thereby, when removing the knockout part 3, the operator can remove the knockout part 3 more efficiently by knocking at the knock position 6. The presence of the knock position 6 improves the work efficiency compared to the case where the knock position 6 is not described. As a result, it is possible to reduce damage to the main body that supports the knock-out portion during the removal operation as much as possible, and easily the knock-out portion. Can be removed.

Next, FIG. 8 shows an example in which removal assisting means 5 is provided in the knockout portion 3 in addition to the configuration of the sixth embodiment as an eighth embodiment. Similar to the above-described removal assisting means 5, the support member disposing part 4a is made efficient by inserting a tool or the like into the gap between the main body 2 and the knockout part 3 formed by providing the removal assisting means 5. The moment of the applied force can be applied, and the main body supporting the knockout portion can be hardly damaged during the removal operation, and the knockout portion can be easily removed. Note that the removal assisting means 5 may be disposed at a position rotated 180 degrees from the position shown in FIG. 8 about the substantially central portion of the hole.

Next, FIG. 9 shows a ninth embodiment in which a round hole 5a for inserting a tool is provided in the knockout portion 3 as a removal assisting means in addition to the configuration of the sixth embodiment. ing. The size of the round hole 5a is set such that a tool can be inserted when the knockout portion 3 is removed.

When removing the knockout portion 3, a tool is inserted into the round hole 5 a so that the knockout portion 3 is rotated about the support member arrangement portion 4 a as a fulcrum. In this case, the support part can be easily broken without hitting the knockout part, and the knockout part can be removed from the main body by rotating the tool forward and backward several times with a tool or fingers. The arrangement position of the removal assisting means 5a may be provided at a position deviated from the substantially central portion of the hole so that the moment of force is more effectively applied to the arrangement portion 4a of the support member.

Next, FIG. 10 shows a tenth embodiment in which a square hole-shaped removal assisting means 5b is provided in place of the round hole-shaped removal assisting means 5a in the configuration of the ninth embodiment. Show. The size of the square hole 5b is such that a tool can be inserted when the knockout portion 3 is removed.

When removing the knockout portion 3, a tool is inserted into the square hole 5 b so that the knockout portion 3 is pivoted with the support member arrangement portion 4 a as a fulcrum, and the direction in which the pivoting is performed is performed. In this case, the support part can be easily broken without hitting the knockout part, and the knockout part can be removed from the main body by rotating the tool forward and backward several times with a tool or fingers. The arrangement position of the removal assisting means 5b may be provided at a position deviated from the substantially central portion of the hole so that a moment of force is more effectively applied to the arrangement portion 4a of the support member.

Next, in FIG. 11, as a eleventh embodiment, in addition to the configuration of the sixth embodiment, as a removal assisting means 5c, a depression is formed in a part of the knockout portion 3 by pressing, and the main body 2 And what was comprised so that it might have a clearance gap between the knockout part 3 is shown. Since the concave portion is provided in the diameter direction, two gaps with the main body are formed in the diameter direction.

When removing the knockout portion 3, the support member placement portion 4a is supported by inserting a tool into the gap on the side where the work is easy to perform, depending on the attachment state of the main body and the work place of the operator. As the knockout part 3 rotates, the support part can be easily broken without hitting the knockout part by rotating the knockout part 3 several times forward and backward with a tool or fingers in the direction of the rotation. Can be removed.

Next, in FIG. 12, as a twelfth embodiment, in addition to the configuration of the sixth embodiment, a part of the body 2 is recessed at the peripheral edge of the knockout portion 3 as a removal assisting means. An example is shown in which a gap 5d is formed between the main body and the knockout part, which is formed by pressing.

When the knockout portion 3 is removed, a tool is inserted into the gap 5d so that the knockout portion 3 rotates with the support portion 4 provided in the diameter direction as a fulcrum. In the direction to be performed, the support portion can be easily broken and removed from the main body by hitting the knockout portion multiple times in the forward and reverse directions with a tool or fingers.

Next, FIG. 13 shows, as the thirteenth embodiment, the center of the hole formed by removing the knockout portion 3 by combining the configuration of the seventh embodiment and the configuration of the eighth embodiment. An example where the knocking position is marked at a position biased from the part and the removal assisting means 5 is provided in the knockout part 3 is shown. Thus, when removing the knockout portion 3, the operator inserts a tool into the gap of the removal assisting means 5 and squeezes, applies the stress to the support member by rotating the knockout portion 3, and then aims at the knocking location. By knocking the knockout portion, the knockout portion 3 can be more easily removed.

Next, FIG. 14 shows, as a fourteenth embodiment, the center of the hole formed by removing the knockout portion 3 by combining the configuration of the seventh embodiment and the configuration of the ninth embodiment. The drawing shows the location where the knocking position is deviated from the portion, and a tool insertion round hole 5a is provided in the knockout portion 3 as a removal assisting means. The size of the round hole 5a is such that a tool can be inserted when the knockout portion 3 is removed.
Thus, when the operator removes the knockout portion 3, the operator inserts a tool into the round hole 5a serving as the removal assisting means 5 and squeezes it, and after rotating the knockout portion 3 to apply stress to the support member, By knocking the knockout portion aiming at the place, the knockout portion 3 can be more easily removed. The arrangement position of the removal assisting means 5a may be provided at a position deviated from the substantially central portion of the hole so that the moment of force is more effectively applied to the arrangement portion 4a of the support member.

Next, FIG. 15 shows, as a fifteenth embodiment, the center of the hole formed by removing the knockout portion 3 by combining the configuration of the seventh embodiment and the configuration of the tenth embodiment. The drawing shows a place where the knocking position is deviated from the part, and a square hole 5b for tool insertion is provided in the knockout part 3 as a removal assisting means. The size of the square hole 5b is such that a tool can be inserted when the knockout portion 3 is removed.
As a result, when the operator removes the knockout portion 3, the operator inserts a tool into the square hole 5b serving as the removal assisting means 5 and twists the knockout portion 3 to rotate the knockout portion 3 to apply stress to the support member. By knocking the knockout portion aiming at the place, the knockout portion 3 can be more easily removed. The arrangement position of the removal assisting means 5b may be provided at a position deviated from the substantially central portion of the hole so that a moment of force is more effectively applied to the arrangement portion 4a of the support member.

Next, FIG. 16 shows, as the sixteenth embodiment, the center of the hole formed by removing the knockout portion 3 by combining the configuration of the seventh embodiment and the configuration of the eleventh embodiment. In addition to marking the location where knocking occurs from the part, as a removal assisting means 5c, a recess is formed in part of the knockout part 3 by pressing so that there is a gap between the main body 2 and the knockout part 3 Is shown in FIG. Since the concave portion is provided in the diameter direction, two gaps with the main body are formed in the diameter direction.

When removing the knockout portion 3, the operator inserts a tool into the gap between the main body 2 and the knockout portion 3 provided by the removal assisting means 5 c and turns the knockout portion 3 to support the member. After the stress is applied to the knockout part, the knockout part 3 can be removed more easily by knocking the knockout part aiming at the knocking place.

Next, FIG. 17 shows, as the seventeenth embodiment, the center of the hole formed by removing the knockout portion 3 by combining the configuration of the seventh embodiment and the configuration of the eleventh embodiment. The main body and the knockout part formed by pressing the main body 2 into the main body 2 at the position of the peripheral edge of the knockout part 3 as a removal assisting means In this example, a gap 5d is provided.

When removing the knockout part 3, the operator inserts a tool into the gap between the main body 2 and the knockout part 3 provided by the removal assisting means 5 d and twists the knockout part 3 to rotate the support member. After the stress is applied to the knockout part, the knockout part 3 can be removed more easily by knocking the knockout part aiming at the knocking place.

Next, FIGS. 18 and 19 show, as an eighteenth embodiment, a knockout structure 1a in which a knockout portion 3a is provided in a main body 2a of a housing for housing a power distribution device. 18 is a view from the back side of the main body 2a, and FIG. 19 is a view from the front side of the main body 2a.

The material constituting the main body of the present embodiment is a resin material, and the knockout portion 3a is formed by providing a cut-off structure at a position of the mold for molding the main body where the knockout structure is provided. 4b is a support part for supporting the knockout part 3a on the main body 2a, and two support parts are provided for one knockout part. Reference numeral 5e denotes a recess formed in the knockout portion 3a provided as a removal assisting means, and as shown in FIG. 19, a gap is provided between the main body 2a and the knockout portion 3a.

When removing the knockout portion 3a, when removing from the back side, the knockout portion 3a can be easily removed by inserting a tool along the concave portion 5e which is a removal assisting means. Further, when removing from the front side, the knockout portion 3a can be easily removed by inserting a tool into the gap between the knockout portion 3a and the main body 2a.

According to the present embodiment, since the knockout operation for causing a part of the main body to be in the drilled state can be performed more efficiently, the electric wire drawing work from the inside of the main body to the outside, and the electric wire drawing work from the outside of the main body to the inside. Leading to greater efficiency.

In addition, the main body 2a of the present embodiment is a frame used as an attachment by being attached to the back of the main body of the housing for housing the power distribution device, in addition to the main body of the housing for housing the power distribution device. It may be used.

It should be noted that the present invention is not limited to the embodiments, and can be freely improved and designed as necessary without departing from the paper of the invention. For example, the present invention is not limited to the seventeenth embodiment. The knockout structure shown in the embodiment may be made of a resin material, and the case body containing the power distribution device shown in the eighteenth embodiment is made of a metal material. Alternatively, the knockout structure may be formed by applying the first to seventeenth embodiments.

As described above, the knockout structure of the present invention is intended to make a part of the main body more easily pierced, so that in addition to the box-shaped main body as shown in the embodiment, for example, a lid shape It can be applied to the case where a part of the wire is made to be pierced or the case where a part of the duct shape is made to be pierced, and can be widely used for improving workability when inserting the electric wire.

It is a figure which shows 1st embodiment of this invention. It is a figure which shows 2nd embodiment of this invention. It is a figure which shows 3rd embodiment of this invention. It is a figure which shows 4th embodiment of this invention. It is a figure which shows 5th embodiment of this invention. It is a figure which shows 6th embodiment of this invention. It is a figure which shows 7th embodiment of this invention. It is a figure which shows 8th embodiment of this invention. It is a figure which shows 9th embodiment of this invention. It is a figure which shows the 10th embodiment of this invention. It is a figure which shows 11th embodiment of this invention. It is a figure which shows 12th embodiment of this invention. It is a figure which shows 13th embodiment of this invention. It is a figure which shows 14th embodiment of this invention. It is a figure which shows 15th embodiment of this invention. It is a figure which shows 16th embodiment of this invention. It is a figure which shows 17th embodiment of this invention. It is a figure which shows 18th embodiment of this invention. It is a figure which shows 18th embodiment of this invention. The figure explaining background art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Knockout structure 2 Main body 3 Knockout part 4 Support part 5 Removal assistance means 6 Knock position

Claims (9)

In the knockout structure in which the knockout portion is provided to be supported in part by the main body, and by removing the knockout portion, the main body is partially drilled.
A knockout structure characterized in that a removal assisting means for assisting the removal of the knockout portion is provided in a part of the knockout structure. The removal assisting means for the knockout part is:
The knockout structure according to claim 1, wherein a gap is provided between the main body and the knockout portion. The removal assisting means for the knockout part is:
The knockout structure according to claim 2, wherein a hole for inserting a tool is provided in the knockout portion. The removal assisting means for the knockout part is:
The knockout structure according to claim 2, wherein a recess is provided in a part of the knockout portion so that a gap is provided between the main body and the knockout portion. The removal assisting means for the knockout part is:
3. The knockout structure according to claim 2, wherein a concave portion is provided in a part of the main body so as to have a gap between the main body and the knockout portion. In the knockout structure in which the knockout portion is provided to be supported in part by the main body, and by removing the knockout portion, the main body is partially drilled.
At least two support members for supporting the knockout portion on the main body are provided. The arrangement portion of the first support member, the substantially central portion of the hole portion obtained by removing the knockout portion, and the second support member A knockout structure, wherein the support member placement portion is provided at a position where an angle formed by a line segment connecting each placement portion is smaller than 180 degrees. The knockout structure according to claim 6, wherein the knocking location is described at a position deviated from a substantially central portion of the hole portion obtained by removing the knockout portion. At least two support members for supporting the knockout portion on the main body are provided. The arrangement portion of the first support member, the substantially central portion of the hole portion obtained by removing the knockout portion, and the second support member The knockout structure according to any one of claims 1 to 5, wherein the support member placement portion is provided at a position where an angle formed by a line segment connecting the placement portion is smaller than 180 degrees. The knockout structure according to claim 8, wherein a knocking location is described at a position deviated from a substantially central portion of the hole portion obtained by removing the knockout portion.

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