JP2018119611A - Panel fixing screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a fixing work without spoiling an appearance in a fixed state of a panel.SOLUTION: When a panel fixing screw 10 is screwed into a panel 50, the panel 50 is cut by a cutting part 18 provided on an opposite surface 14a to the panel of a head part 14, and a counter boring part 52 is formed. The panel 50 is fixed in a state that the head 14 is sunk in the counter boring part 52. Due to that the head part 14 is spread in parallel to an orthogonal surface to a shaft center of a shank 12, and has a disc shape thinner than a thickness of the panel 50, the head part 14 is entirely sunk into the counter boring part 52. Cutting chips 50a generated by cutting the panel 50 by the cutting part 18 are stored in a storage part 20 between the opposite surface 14a of the panel of the head part 14, and a seating face 52a (see figure 3) of the counter boring part 52. Even when part of the cutting chips 50a extrude from the storage part, the cutting chips 50a are efficiently cut by receiving shearing action by a peripheral wall connected to an outer peripheral edge 52b of the counter boring part 52 and a peripheral edge part 14c of the head part 14, and is separated from the panel 50.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a panel fixing screw for fixing a panel to a fixed member such as a column.

Conventionally, a so-called drill screw 100 as shown in FIG. 4 is used to fix the panel to a fixed member such as a pillar. The drill screw 100 includes a shaft portion 102 in which a thread is formed, a head portion 104 positioned on the proximal end side of the shaft portion 102, and a drill portion 106 provided on the distal end side of the shaft portion 102. . Then, when the drill screw 100 is screwed into the panel, the screw portion 106 is screwed into the panel and the fixed member by the drill portion 106 while the shaft portion 102 is screwed together, and the head 104 faces the panel 104a. Is in contact with the panel surface, the panel is pressed against the fixed member and fixed.
Further, since the facing surface 104a of the head 104 facing the panel has a truncated cone shape, the panel is plastically deformed by the head 104 to form a counterbore, and the head 104 is immersed in the counterbore. As a result, the panel is fixed in such a manner that the head 104 does not protrude from the surface of the panel. In addition, there is a drill screw in which a protrusion for efficiently forming a counterbore is formed on a surface of the head 104 facing the panel (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-339314

As described above, when fixing a panel to a fixed member using a drill screw, it is only necessary to screw in the drill screw without providing a preliminary hole for screwing the panel and the fixed member in advance. Thus, there is an advantage that the panel fixing operation is completed, and the panel fixing operation can be simplified.
However, the cutting scraps of the panel generated at the time of forming the screw hole or the counterbore remain in a state of protruding from between the outer peripheral edge of the counterbore formed on the panel surface by the head and the head of the drill screw, Problems such as loss of the appearance of the panel in a fixed state have been pointed out. Therefore, in order to improve the appearance of the panel in the fixed state, it is necessary to remove the cutting waste. As a result, the effect of reducing the fixing work by using the drill screw is reduced.

Such a drawback of the drill screw is not sufficiently solved even if a pilot hole is formed in advance when the panel is screwed. The above problem is not limited to the drill screw, and the same applies to a case in which a counterbore for screwing in a mode in which the head is embedded in the panel is formed by the head during screwing work.
The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to simplify the fixing work without impairing the appearance of the panel in the fixed state.

(Aspect of the Invention)
The following aspects of the present invention exemplify the configuration of the present invention, and will be described separately for easy understanding of various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the components of each section are replaced, deleted, or further while referring to the best mode for carrying out the invention. Those to which the above components are added can also be included in the technical scope of the present invention.

(1) A panel fixing screw including a shaft portion on which a screw thread is formed and a head portion located on the proximal end side of the shaft portion, wherein the head portion is orthogonal to the shaft center of the shaft portion. Forming a disc shape extending in parallel with the surface and thinner than the thickness of the panel as a fixed member, and cutting the panel to form a counterbore on the surface facing the panel; A panel fixing screw comprising: an accommodating portion that accommodates cutting scraps of the panel between the face of the counterbore.
When the panel fixing screw described in this section is screwed into the panel, the panel is cut by a cutting portion provided on the surface of the head facing the panel to form a counterbore. Then, the panel is fixed with the head immersed in the spot facing. Moreover, since the head extends in parallel with the plane perpendicular to the axis of the shaft portion and has a disk shape thinner than the thickness of the panel as the fixed member, the entire head is immersed in the counterbore, It does not protrude from the panel surface.
In addition, the cutting waste generated when the panel is cut by the cutting portion is accommodated in the accommodating portion between the face of the head facing the panel and the seating surface of the counterbore, thereby forming a seat formed on the surface of the panel. Thus, it is possible to prevent the cutting waste from remaining between the outer peripheral edge of the bore and the head of the drill screw.

(2) In the above item (1), the surface of the head facing the panel is spaced apart from a flat portion extending in parallel with a plane perpendicular to the axis of the shaft portion, and in the direction around the shaft center of the shaft portion. A plurality of ridges protruding at an acute angle from the flat part, and the ridges adjacent to each other in the direction around the axis of the shaft part and the flat part positioned therebetween, A panel fixing screw in which the housing portion is formed (Claim 2).
In the panel fixing screw described in this section, the cutting waste separated from the panel by the projecting portion is a flat portion extending in parallel with the surface perpendicular to the axis of the shaft portion of the surface facing the panel of the head portion, Most of the housing is housed in a housing portion composed of a plurality of protrusions projecting at an acute angle from the flat portion with an interval in the direction around the shaft center of the shaft portion. And the cutting waste in a storage part is hold | maintained between the opposing surface with the panel of a head, and the face of a spot face, and is compressed. Moreover, even if a part of the cutting waste protrudes without being fully accommodated in the accommodating portion, the cutting waste is sheared by the peripheral wall following the outer peripheral edge of the counterbore and the peripheral edge of the head, and discharged from the counterbore. It will be completely separated.

(3) In the above item (2), the protrusion is a panel fixing screw that extends from a peripheral portion of the head in a direction in which the shaft portion is positioned (claim 3).
In the panel fixing screw described in this section, since the protruding portion extends from the peripheral portion of the head in the direction in which the shaft portion is positioned, the panel has a shaft portion from the peripheral portion of the head portion. The counterbore is formed in the range up to and the accommodating portion is configured in this range, and the action of the above item (2) is obtained. In particular, in a mode in which the ridge portion faces the peripheral portion, the peripheral wall of the spot facing formed by the ridge portion is formed so as to be perpendicular to the panel surface by being provided in the flat portion of the head. It becomes. For this reason, even if a part of the cutting waste protrudes from the housing portion, the cutting waste is efficiently cut by receiving a shearing action by the peripheral wall connected to the outer peripheral edge of the counterbore and the peripheral edge of the head. It is discharged from the chest and completely separated from the panel.

(4) In the above items (2) and (3), the protruding portion is provided on the line passing through the axis of the shaft portion and has a constant width in a plan view, and the flat portion has a fan shape in a plan view. A panel fixing screw (Claim 4).
The panel fixing screw described in this section is a cutting portion in which a protrusion provided on a line passing through the shaft center of the shaft portion and having a constant width in a plan view is provided on a surface facing the head panel. A functioning portion and a flat portion that forms a fan shape in a plan view constitute a housing portion, and the effects of the above items (2) and (3) can be obtained.

(5) In the above items (2) to (4), the ridge portion has a wedge shape including an inclined surface facing the screwing direction of the shaft portion and a vertical surface rising from the flat portion. A panel fixing screw (claim 5).
When the panel fixing screw described in this section is screwed into the panel, it is formed by a wedge-shaped ridge formed by an inclined surface facing the screwing direction of the shaft portion and a vertical surface rising from the flat portion. The panel is cut to form a counterbore. In addition, the protruding part in this section has a vertical surface rising from the flat part facing the direction opposite to the screwing direction of the shaft part, that is, the loosening direction of the shaft part. It has a more suitable form in order to exert a detent function with respect to the direction.

(6) In the above items (2) to (4), the protruding portion is composed of an inclined surface facing in a direction opposite to the screwing direction of the shaft portion and a vertical surface rising from the flat portion. A panel fixing screw having a wedge shape (Claim 6).
The panel fixing screw described in this section, when screwed into the panel, has a wedge shape composed of an inclined surface facing in a direction opposite to the screwing direction of the shaft portion and a vertical surface rising from the flat portion. The panel is cut by the protruding portion to form a counterbore. In addition, since the vertical surface rising from the flat portion faces the screwing direction of the shaft portion, that is, the screwing direction of the shaft portion, the protruding portion of this section exhibits a cutting function for cutting the panel. In other words, it has a more suitable form.

(7) In the above items (2) to (6), the length of the fan-like long arc side in plan view of the flat portion is not less than the width in plan view of the protrusion and not more than twice. Panel fixing screw (Claim 7).
The panel fixing screw described in this section is configured such that the length of the fan-like long arc side in a plan view of the flat portion is equal to or more than twice the width in the plan view of the protrusion. Thus, when screwed into the panel, the cutting function of the panel by the projecting portion, the cutting portion by the accommodating portion constituted by the protruding ridge portion adjacent in the direction around the axis of the shaft portion and the flat portion located therebetween. The waste compression function is secured at a high level. That is, when the length of the fan-like long arc side in plan view of the flat part is less than the width in plan view of the ridge part, the flat part of the flat part on the surface facing the head panel The occupation range is considerably reduced, and the amount of cutting waste accommodated by the accommodating portion is insufficient. Also, if the length of the fan-like long arc side in plan view of the flat part exceeds twice the width of the ridge part in plan view, the protrusion on the face of the head facing the panel The occupying range of the ridge is considerably reduced, and the cutting function by the ridge is not sufficiently exhibited.

(8) The panel fixing screw according to (1) to (7) above, wherein a diameter of the head is set to be twice or more a nominal diameter of the shaft portion (claim 8).
The panel fixing screw described in this section is set so that the head diameter is set to at least twice the nominal diameter of the shaft thread, so that the projected area on the panel in plan view of the head is This is a wider area than the general projected area according to the nominal diameter of the mountain. Therefore, the counterbore is formed in a wide range by the head, and the function of holding the panel by the head is exhibited over a wide range. Moreover, cutting waste generated by cutting the panel over a wide range is held and compressed as described above.

(9) In the above items (1) to (8), a conical truncated-diameter enlarged portion is provided in a connection portion of the shaft portion with the head portion, and an engagement hole of a screwing tool is provided on the head portion. A panel fixing screw formed so as to reach from the end face to the enlarged diameter portion (claim 9).
In the panel fixing screw described in this section, the engagement hole of the screwing tool is provided so as to reach from the end surface of the head portion to the truncated cone-shaped enlarged portion provided at the connection portion with the head portion of the shaft portion. By being formed, the engagement depth of the screwing tool is sufficiently ensured in the engagement hole. For this reason, sufficient rotational torque (tightening torque and loosening torque) can be applied to the panel fixing screw by the screwing tool.

(10) In the items (1) to (9), a panel fixing screw including a drill portion on a tip end side of the shaft portion (claim 10).
The panel fixing screw described in this section is configured as a drill screw by providing a drill portion on the distal end side of the shaft portion. When screwed into the panel, the screw hole is made by the drill portion by itself to the panel and the member to be fixed. The panel is pressed against the member to be fixed and is fixed by advancing the screwing while being formed, and the surface of the head facing the panel contacting the panel surface. And the said effect | action is acquired about the cutting waste of the panel produced at the time of formation of the screw hole by a drill part, or the formation of the counterbore by a head.

  Since the present invention is configured as described above, it is possible to simplify the fixing operation without impairing the appearance of the panel in the fixed state.

BRIEF DESCRIPTION OF THE DRAWINGS It shows the panel fixing screw which concerns on embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a back view, (d) is a three-dimensional figure, (e) is A side view of another example, (f) is a back view of another example. It is sectional drawing which shows the state which fixed the lining panel in a container room to the lining receptacle using the panel fixing screw which concerns on embodiment of this invention. In the example of FIG. 2, a schematic view showing a state in which cutting waste generated by cutting the panel by the cutting unit is stored in the storage unit, and part of the cutting waste is discharged from a spot face and completely separated from the panel. is there. The conventional drill screw is shown, (a) is a top view, (b) is a front view, (c) is a back view.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Here, parts that are the same as or correspond to those in the prior art are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 1B, the panel fixing screw 10 according to the embodiment of the present invention includes a shaft portion 12 on which a thread 12a is formed, and a head portion located on the proximal end side of the shaft portion 12. 14 and a drill screw provided with a drill portion 16 on the distal end side of the shaft portion 12.
Head 14 is spread parallel to the plane orthogonal to the axis C ₁₂ of the shaft portion 12, and has a thin disk-like than the thickness of the panel 50 as the fixation member (see FIGS. 2 and 3). In the illustrated example, the face 14a (the lower surface in FIG. 1 (b)) of the head 14 facing the panel 50 and the end face 14b (the upper surface in FIG. 1 (b)) are formed in parallel to each other. In the vicinity of the outer peripheral edge 14c of 14, the end surface 14b is gently inclined and connected to the outer peripheral edge 14c.

And the cutting part 18 which cuts the panel 50 in the opposing surface 14a with the panel 50 of the head 14 and forms the counterbore 52 (refer FIG. 2, FIG. 3), and the cutting waste of the panel 50 produced by the cutting part 18 50a (refer FIG. 2, FIG. 3) and the accommodating part 20 which accommodates between the seating surfaces 52a of the spot facing 52 are provided.
More specifically, the counter surface 14a of the panel of the head 14 includes a flat portion 24 extending parallel to the plane orthogonal to the axis C ₁₂ of the shaft portion 12, the axis C ₁₂ about the direction of the shaft section 12 And a plurality of ridges 22 projecting from the flat part 24 at an acute angle with a space therebetween. Then, in the flat portion 24 located therebetween and protrusions 22 adjacent to the axis C ₁₂ about the direction of the shaft portion 12, housing portion 20 is formed. On the other hand, the protruding portion 22 constitutes the cutting portion 18 by itself.

Further, the protruding portion 22 extends from the peripheral edge portion 14 c of the head portion 14 in the direction in which the shaft portion 12 is positioned. In the illustrated example (see FIG. 1C), the protrusion 22 is provided on a line passing through the axis C12 of the shaft ₁₂ and has a constant width in plan view, and the flat portion 24 is in plan view. It has a fan shape.
In the illustrated example, the thread 12a of the shaft portion 12 forms a right-hand thread, and in the example shown in FIGS. 1B and 1C, the protrusion 22 faces the screwing direction of the shaft portion 12. It has a wedge shape composed of an inclined surface 22 a and a vertical surface 22 b rising from the flat portion 24. On the other hand, in the panel fixing screw 10 ′ shown in FIGS. 1E and 1F, the protrusion 22 has an inclined surface 22a facing in the direction opposite to the screwing direction of the shaft portion 12, and a flat portion. 24 and a vertical surface 22b rising from 24. Note that the panel fixing screw 10 shown in FIGS. 1B and 1C and the panel fixing screw 10 ′ shown in FIGS. 1E and 1F are an inclined surface 22a of the wedge of the ridge 22 and Since it has a common shape except for the arrangement of the vertical surface 22b, the description of the configuration of the panel fixing screw 10 ′ other than the protrusions 22 will be omitted.

In addition, the shape of the protrusion part 22 is not limited to the example of illustration. For example, both the screwing direction of the shaft portion 12 and the opposite direction may be configured by the inclined surface 22a (in this case, the inclined surface 22a becomes steeper), or the inclined surface 22a and the vertical surface 22b. between, through a plane extending parallel to the plane orthogonal to the axis C ₁₂ of the shaft portion 12, both may be connected.

Further, in the illustrated example, the length L of the fan-like long arc side in the plan view of the flat portion 24 is set to be not less than twice and not more than twice the width W in the plan view of the protrusion 22. Furthermore, the diameter D of the head portion 12 is set to be twice or more the nominal diameter of the thread of the shaft portion 12.
As a specific example, when the panel 50 (see FIGS. 2 and 3) as a member to be fixed is a Lauan material or a resin material with a thickness of 4 mm, the nominal diameter of the thread 12a is M5 and the diameter of the head 14 D is 14.5 mm, the length L of the fan-like long arc side in plan view of the flat portion 24 is about 2.7 mm, the width W in plan view of the protrusion 22 is 1.8 mm, and the height H is Ten ridges 22 are provided at 0.6 mm. The thickness t of the head 14 is 1.8 mm.

Further, in the example shown in the figure, a truncated cone-shaped enlarged diameter portion 26 is provided at a connection portion of the shaft portion 12 with the head portion 14, and the engagement hole 14 d of the screwing tool is extended from the end surface 14 b of the head portion 14. 26 (see FIG. 1B). In addition to the specific examples of the above dimensions, as specific examples of the dimensions of the enlarged diameter portion 26, the maximum diameter of the enlarged diameter portion 26 is 6.12 mm, the taper angle of the enlarged diameter portion 26 is 76 °, and the screw of the enlarged diameter portion 26 The length from the connection part with the mountain 12a to the end surface 14b of the head 14 is 2.9 mm. The specific example of the dimension of the drill part 16 provided in the front end side of the axial part 12 is diameter 4.3mm, length 9mm, and the length from the front-end | tip of the drill part 16 to the end surface 14b of the head 14 is 20mm. Yes. Further, the installation range of the drill portion 16 may be formed so as to partially overlap the screw thread 12a of the shaft portion 12 as illustrated, or may be formed so as not to overlap. The angle of the thread 12a is 60 °.
The specific numerical values described above are merely examples, and are set as appropriate according to the specifications of the panel 50 and the lining receiver 54 (see FIG. 2).

  The manufacturing procedure of the panel fixing screw 10 according to the embodiment of the present invention includes forming a coiled material in a straight line, cutting it into a predetermined length, roughly forging the shape of the head 14, The shape of the head 14 is forged into a product shape, and an engagement hole 14d of a screwing tool (in the example shown, a cross hole, but a single character hole, a hexagonal hole, or a special shape hole may be selected. ). Subsequently, the blade shape of the drill portion 16 is forged, and finally the thread 12a is forged. Further, in order to prevent seizure, a wax treatment is performed as a surface treatment, and the panel fixing screw 10 is completed.

FIG. 2 shows an example in which the panel fixing screw 10 according to the embodiment of the present invention is used when fixing the panel 50 as the lining in the container chamber to the outer plate 56 and the lining receiver 54. Yes. The lining receiver 54 and the outer plate 56 are made of metal, and when the panel fixing screw 10 is screwed into the panel 50, the threaded holes 16 are formed on the panel 50 and the lining receiver 54 by the drill portion 16, The screwing of the shaft portion 12 with respect to both 50 and the lining support 54 is advanced. Then, when the facing surface 14a of the head 14 with the panel 50 abuts against the panel surface (the seating surface 52a of the spot facing 52), the panel 50 is pressed against the lining support 54 and fixed.
As shown in FIG. 3, most of the cutting scraps 50 a of the panel 50 that are generated when the counterbore 52 is formed by the head portion 14 (in some cases, metal scraps at the time of forming screw holes by the drill portion 16). It is accommodated in the accommodating part 20. Even if a part of the cutting waste 50 a protrudes from the housing portion 20, the cutting waste 20 a is sheared by the outer peripheral edge 52 b of the counterbore 52 and the peripheral wall following the outer peripheral edge 14 c of the head 14, Discharged.

Now, according to the embodiment of the present invention configured as described above, the following operational effects can be obtained.
When the panel fixing screw 10 according to the embodiment of the present invention is screwed into the panel 50, the panel 50 is cut by the cutting portion 18 provided on the surface 14 a of the head 14 facing the panel, and the counterbore 52. Is formed. The panel 50 is fixed in a state where the head 14 is immersed in the spot facing 52. Moreover, the head 14, the head since it forms a thin disk-like than the thickness of the panel 50 as the fixation member spreads parallel to the plane orthogonal to the axis C ₁₂ of the shank 12, into the counterbore 52 All the portions 14 are immersed and do not protrude from the surface of the panel 50.
Further, the cutting waste 50a generated by cutting the panel 50 by the cutting portion 18 is a housing portion between the facing surface 14a of the head 14 facing the panel and the seating surface 52a (see FIG. 3) of the spot facing 52. 20 is effectively prevented from remaining in a state where the cutting waste 50a protrudes from between the outer peripheral edge 52b of the counterbore 52 formed on the surface of the panel 50 and the head 14. Can do.

Also, cuttings 50a separated from panel 50 by the projecting portion 22, the opposing surface 14a of the panel of the head 14, a flat portion 24 extending parallel to the plane orthogonal to the axis C ₁₂ of the shaft portion 12 , the plurality of protrusions 22 and the accommodating portion 20 constituted by protruding from the axis C ₁₂ around flat portion 24 at intervals in the direction of the shaft portion 12 at an acute angle shape, most of which are housed. And the cutting waste 50a in the accommodating part 20 is hold | maintained between the opposing surface 14a with the panel of the head 14, and the seating surface 52a of the spot facing 52, and is compressed (refer FIG. 3). Even if a part of the cutting waste 50a protrudes without being fully accommodated in the accommodating portion 20, the cutting waste 50a is sheared by the peripheral wall following the outer peripheral edge 52b of the counterbore 52 and the peripheral edge 14c of the head 14. It is discharged from the counterbore 52 (see FIG. 3) and completely separated from the panel 50.

  In addition, since the protruding portion 22 extends from the peripheral portion 14 c of the head 14 in the direction in which the shaft portion 12 is positioned, the panel 50 includes the peripheral portion 14 c of the head 14 to the shaft portion 12. The counterbore 52 is formed in the entire range, and the accommodating portion 20 is configured in this range, and the above-described effects can be obtained. In particular, the peripheral wall of the counterbore 52 formed by the ridge 22 is provided on the flat portion 24 in such a manner that the ridge 22 faces the peripheral edge 14c of the head 14. It becomes the aspect which stood up so that it might orthogonally cross. For this reason, even if part of the cutting waste protrudes from the housing portion, the cutting waste 50a is subjected to a shearing action by the peripheral wall connected to the outer peripheral edge 52b of the spot facing 52 and the peripheral edge 14c of the head 14. It is efficiently cut and discharged from the counterbore 52 and completely separated from the panel 50.

Further, the ridge 22 provided on the line passing through the axis C12 of the shaft ₁₂ and having a constant width in a plan view functions as the cutting portion 18 provided on the surface 14a facing the panel of the head 14. And the accommodating part 22 is comprised by this protrusion part 22 and the flat part 24 which has comprised the fan shape by planar view, and the said effect is obtained.
In the example shown in FIGS. 1B and 1C, it is configured by an inclined surface 22a facing the screwing direction of the shaft portion 12 and a vertical surface 22b rising from the flat portion 24 when screwed into the panel 50. The panel 50 is cut by the wedge-shaped projecting ridge portion 22 to form a counterbore 52. Further, since the vertical surface 22 b rising from the flat portion 24 faces the direction opposite to the screwing direction of the shaft portion 12, that is, the loosening direction of the shaft portion 12, the protruding portion 22 corresponds to the loosening direction of the shaft portion 12. It has a more suitable form for exhibiting the detent function.

  On the other hand, in the example shown in FIGS. 1E and 1F, when screwed into the panel 50, the inclined surface 22a facing in the direction opposite to the screwing direction of the shaft portion 12 and the flat portion 24 are used. The panel 50 is cut by the wedge-shaped protrusion 22 formed by the vertical surface 22b that rises, and a counterbore 52 is formed. Further, since the vertical surface 22b rising from the flat portion 24 faces the screwing direction of the shaft portion 12, that is, the screwing direction of the shaft portion 12, the protruding portion 22 exhibits a cutting function of cutting the panel 50. Have a more suitable form.

Further, the length L of the fan-like long arc side in the plan view of the flat portion 24 is configured to be not less than the width W and not more than twice the width W in the plan view of the ridge 22. When being screwed into the panel 50, the cutting function of the panel 50 by the projecting portion 22, the protruding portion 22 adjacent in the direction around the axis of the shaft portion 12, and the flat portion 24 located therebetween is accommodated. Both the accommodation compression function of the cutting waste 50a by the part 20 will be secured in a high dimension.
That is, when the length L of the fan-like long arc side in the plan view of the flat portion 24 is less than the width W in the plan view of the ridge 22, the surface of the head 14 facing the panel The occupation range of the flat part 24 in 14a becomes considerably small, and the amount of cutting waste accommodated by the accommodating part 20 is insufficient. When the length L of the fan-like long arc side in the plan view of the flat portion 24 exceeds twice the width W in the plan view of the protrusion 22, The occupying range (number of installations) of the ridges 22 on the opposite surface 14a is considerably reduced, and the cutting function by the ridges 22 is not sufficiently exhibited.

Furthermore, the diameter of the head 14 is set to be twice or more (14.5 mm) of the nominal diameter M5 of the thread 12a of the shaft portion 12, so that the projected area of the head 14 on the panel 50 in a plan view. However, it is over a wider range than a general projected area corresponding to the nominal diameter of the thread 12a. Therefore, the spot face 52 is formed in a wide range by the head 14 and the holding function of the panel 50 by the head 14 is exhibited in a wide range. Moreover, the cutting waste 50a generated by cutting the panel 50 over a wide range is held and compressed as described above.
According to the inventors' investigation, the upper limit of the diameter of the head 14 is 3 of the nominal diameter of the thread 12a of the shaft portion 12 in consideration of the productivity and strength of the panel fixing screw 10 at the present time. It is desirable to set it to be twice or less.

  In addition, an engagement hole 14d of the screwing tool is formed so as to reach from the end surface of the head portion 14 to the truncated cone-shaped enlarged diameter portion 26 provided at the connection portion of the shaft portion 12 with the head portion 14. As a result, the engagement hole 14d has a sufficient depth of engagement with the screwing tool. For this reason, it becomes possible to give sufficient rotational torque (tightening torque and loosening torque) to the panel fixing screw 10 by the screwing tool.

  In the embodiment of the present invention, the panel fixing screw 10 is configured as a drill screw including the drill portion 16 on the distal end side of the shaft portion 12, but it is understood that the present invention can be applied to other than the drill screw. It will be. It will be understood that the panel fixing screw 10 can be used for purposes other than fixing the panel 50 as a lining in the container chamber to the lining receiver 54.

  10, 10 ': Panel fixing screw, 12: Shaft, 12a: Screw thread, 14: Head, 14a: Face facing the panel, 14b: End face, 14c: Peripheral part, 16: Drill part, 18: Cutting Part: 20: accommodating part, 22: ridge part, 24: flat part, 26: diameter-expanded part, 50: panel, 50a: cutting waste, 52: counterbore, 52a: seating surface, 52b: outer peripheral edge, 54 : Lining holder, D: head diameter, L: length of fan-like long arc side in plan view of flat part, W: width in plan view of ridge part, H: height of ridge part , T: head thickness

Claims (10)

A panel fixing screw including a shaft portion on which a screw thread is formed and a head portion located on the proximal end side of the shaft portion,
The head portion is formed in a disk shape extending in parallel to a plane orthogonal to the axis of the shaft portion and being thinner than the thickness of the panel as a fixed member, and the seat is formed by cutting the panel on a surface facing the panel. A panel fixing screw, comprising: a cutting portion that forms a bore; and a housing portion that accommodates cutting scraps of the panel generated by the cutting portion between a seat surface of the counterbore. The surface of the head facing the panel is a flat portion extending in parallel with a plane orthogonal to the shaft center of the shaft portion, and an acute angle from the flat portion with a space in the direction around the shaft center of the shaft portion. A plurality of projecting ridges projecting on the axis, and the accommodating section is configured by the projecting ridges adjacent to each other in a direction around the axis of the shaft and the flat portion positioned therebetween. The panel fixing screw according to claim 1. The panel fixing screw according to claim 2, wherein the protruding portion extends from a peripheral portion of the head in a direction in which the shaft portion is positioned. The said protrusion part is provided on the line which passes along the axial center of the said shaft part, and is provided with fixed width by planar view, The said flat part has comprised the fan shape by planar view. Or the panel fixing screw of 3. The said protrusion part has comprised the wedge shape comprised by the inclined surface which faced the screwing direction of the said shaft part, and the perpendicular | vertical surface which stands | starts up from the said flat part, The any one of Claim 2 to 4 characterized by the above-mentioned. The panel fixing screw according to claim 1. The said protrusion part has comprised the wedge shape comprised by the inclined surface which faced the opposite direction to the screwing direction of the said axial part, and the perpendicular | vertical surface which stands | starts up from the said flat part. The panel fixing screw according to any one of claims 1 to 4. The length of the fan-like long arc side in plan view of the flat portion is not less than twice and not more than twice in width in plan view of the ridge portion. The panel fixing screw described in the item. The panel fixing screw according to any one of claims 1 to 7, wherein a diameter of the head is set to be twice or more a nominal diameter of a screw thread of the shaft portion. A conical cone-shaped enlarged diameter portion is provided at a connection portion of the shaft portion with the head, and an engagement hole of a screwing tool is formed so as to reach the enlarged diameter portion from an end surface of the head. The panel fixing screw according to any one of claims 1 to 8, wherein the panel fixing screw is characterized by that. The panel fixing screw according to any one of claims 1 to 9, wherein a drill portion is provided on a distal end side of the shaft portion.

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