JP2006308079A - Wood screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood screw having improved holding force by increasing a wood catching rate and extracting strength as functions required for the wood screw to mount a sink cabinet or a washing and dressing board on a wall face, and having greatly reduced manufacturing cost while surely preventing the flotation of the cabinet when fixed to the wall and preventing the jump-up of a screw head. <P>SOLUTION: The wood screw comprises the large dish shaped screw head having a diameter at least twice the diameter of a screw shaft, a plurality of ribs protruded on a truncated cone shaped slope formed between the screw head and the screw shaft, a knife shaped knurling portion having a diameter somewhat larger than the diameter of the screw shaft, a screw thread formed between the front end of the screw shaft and the knurling portion, and a front split sharp tip formed at the front end of the screw thread. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention mainly relates to a wood screw used for fixing a cabinet such as a sink or a vanity to a wall surface.

Conventionally, as wood screws that can be used for this type of use, for example, wood screws as shown in Patent Documents 1 to 3 have been proposed.

Utility Model Registration No. 3027065

No. 8-7135

JP 2003-42121 A

  The wood screw shown in Patent Document 1 is a wood screw provided with a sharp portion at the tip of a screw shaft portion, a head portion at a tail end, and a screw thread formed on the outer periphery of the screw shaft portion. The thread formed in the front region reaching the middle part of the shaft portion is composed of a double thread comprising an introduction thread having a large thread diameter and an auxiliary thread having a small thread diameter, and the front region A screw thread formed in a rear region extending from the screw shaft portion toward the tail end of the screw shaft portion is formed of a fastening screw thread formed continuously from the lead screw thread and having a larger diameter than the lead screw thread. It consists of a single thread.

Moreover, the wood screw shown in Patent Document 2 is a wood screw having a flat head with a driver groove formed therein and a screw thread formed in a spiral shape on the outer peripheral surface of a screw shaft portion with a sharpened tip. On the surface of the screw shaft part between the screw thread and the thread, an uneven knurled blade-shaped knurl that is vertically long along the length direction of the screw shaft part and has a diameter slightly larger than the outer diameter of the screw shaft part is formed. Configured.

Furthermore, the wood screw shown in Patent Document 3 has a head having a bit hole at one end of the screw shaft portion and a sharp tip at the other end, and the first screw extends from the outer peripheral surface of the screw shaft portion to the tip. And a wood screw having a double lead thread in which a second thread having a nominal diameter smaller than that of the first thread is alternately arranged, and from the base of the first thread The shaft portion is configured to gradually reduce the diameter toward the base of the second screw thread.

However, since the screw head is not formed so large in Patent Document 1, the holding force for the cabinet is small, and the diameter of the base of the screw shaft portion cannot be increased. In addition, the screw shaft portion between the screw head and the screw thread is not formed with unevenness, so that when the cabinet is fixed to the wall, the cabinet floats, i.e., with the wall surface. There was a problem that a gap was generated between them.

In addition, the wood screw shown in Patent Document 1 has a structure in which the screw thread is also formed with a small-diameter screw thread on the tip side of the large-diameter screw thread. Since the holding power is weak, as wood screws for mounting cabinets such as sinks and vanities, the holding power is weak and it is desirable to fix the cabinet to the wall surface with as few as possible. In order to increase the height, the wood screw of Patent Document 1 has to use a large number of screws, so that the mounting work becomes very complicated and the cost is high.

In the wood screw of Patent Document 2, a knurl is formed in the screw shaft portion, but the screw head is not formed so large in diameter that the holding force against the cabinet is small. Since the diameter of the base cannot be increased, so-called jumping of the screw head is likely to occur, and furthermore, since the thread is also formed with a single thread, the rate of catching on the wood is low and the pulling strength is low. Since the holding force of the wood screw is weak because it is small, the wood screw for mounting a cabinet such as a sink or vanity has a problem similar to that of Patent Document 1 because the holding force is weak.

Moreover, even if it exists in the wood screw of patent document 3, in the point which is a wood screw with the screw thread of a double lead, although it has the advantage that the catch rate to a timber is high and the extraction strength is also large, it is small Since the screw head is not formed so large in diameter, the holding force to the cabinet is small, and since the diameter of the base of the screw shaft portion cannot be increased, so-called jumping of the screw head is likely to occur. Since the screw shaft between the screw head and the screw thread is not uneven, there is a problem that when the cabinet is fixed to the wall, a gap is generated between the cabinet and the wall. Was.

As described above, the wood screws shown in Patent Documents 1 to 3 have advantages and disadvantages in terms of their holding power, etc., as mounting wood screws for cabinets such as sinks and vanities, and in particular, the problem of skipping the screw head cannot be cleared. Due to the structure, there is a problem that the manufacturing cost increases.

The present invention was devised in view of the current situation, and the object of the present invention is, in particular, to wood, which is a function required as a wood screw for attaching a cabinet such as a sink or vanity to a wall surface. The catching rate of the steel can be increased, the pull-out strength can be increased, the holding power can be increased, and the cabinet can be reliably prevented from floating when the cabinet is fixed to the wall. It is intended to provide a wood screw that can prevent the bite of the screw from entering the cabinet and ensure the mounting of the cap, and can further prevent the screw head from jumping and can greatly reduce the manufacturing cost. Is.

  In order to achieve the above object, the wood screw according to claim 1 is a large plate-shaped screw head formed to have a diameter that is twice or more the screw shaft diameter, and the screw head and screw shaft portion. A plurality of ribs projecting from a truncated cone-shaped inclined surface, a knurled blade-shaped knurl portion formed slightly larger than the shaft diameter of the screw shaft portion, and a screw shaft portion A thread formed between the tip part and the knurled part, and a substantially V-shaped pointed tip part obtained by cutting the planar shape formed at the tip part of the thread into a substantially crescent shape. The thread is formed of a double lead thread in which a first thread and a second thread having a smaller nominal diameter than the first thread are alternately arranged, and The tip of the tip is a chip cut by rotation after the tip of the tip bites into the fastened member Characterized in that it is cut formed so as to be discharged without being compressed.

In addition, the invention according to claim 2 is based on the technical premise of the wood screw according to claim 1, and a step portion is formed between the screw head and the truncated cone-shaped inclined surface. To do.

Furthermore, the invention according to claim 3 is based on the technical premise of the wood screw according to claim 1 or 2, and a synthetic resin color cap is detachably fitted to the screw head. It is characterized by that.

  As described above, in the invention described in claim 1, since the platter-shaped screw head formed to have a diameter that is twice or more the screw shaft diameter is configured, Since the force increases and the diameter of the base of the screw shaft portion can be increased, so-called jumping of the screw head can be eliminated, and the strength of the screw head can be ensured.

Moreover, in the wood screw according to claim 1, since the plurality of ribs project from the truncated cone-shaped inclined surface formed between the screw head and the screw shaft portion, it is possible to prevent idling. At the same time, it is possible to effectively prevent the screw head from floating due to the seating action.

Furthermore, in the wood screw according to claim 1, since the knurled blade-shaped knurl portion formed slightly larger than the shaft diameter of the screw shaft portion is disposed, the cabinet is fixed to the wall surface. Further, it is possible to reliably prevent the cabinet from floating, that is, the occurrence of a gap between the cabinet and the wall surface.

Further, in the wood screw according to claim 1, the thread formed between the tip end portion of the screw shaft portion and the knurled portion has a nominal diameter from the first thread and the first thread. Since the thread is formed by double lead threads alternately arranged with small second threads, the rate of catching on the wood is increased and the pulling strength is increased, so that the holding force of the wood screws can be increased.

Furthermore, in the wood screw according to claim 1, since the substantially V-shaped pointed tip portion having a planar shape cut into a substantially crescent shape is formed at the tip portion of the screw thread, the tip point portion of the tip end The bite to the fastened member by the screw is very good, and the chips cut by the rotation of the wood screw are not easily compressed, and are smoothly discharged upward along the V-shaped surface. Not only with excellent drilling functions, but also with conventional wood and wood-based interior materials and some new building materials, as well as hard wood with many vertical eyes, hard wood with knots, and wood waste Even in various interior materials and building materials such as particle boards, compression boards, gypsum boards, aluminum boards, vinyl chloride boards, thin iron boards or cement boards that are hardened, cracks are less likely to occur and workability can be improved.

In the invention according to claim 2, since the step portion is formed between the screw head and the truncated cone-shaped inclined surface, the wood screw may be tightened too strongly with an electric screwdriver or the like. The screw head does not bite into the back plate or the like of the cabinet, and a clearance due to the step portion is formed between the back plate and the screw head, so that the synthetic resin color cap can be securely attached.

Furthermore, in the invention according to claim 3, since the synthetic resin color cap can be detachably fitted to the screw head, the color cap is attached to, for example, a cabinet after the wood screw is attached. By using the same color as the back plate, the screw head can be hidden, the color uniformity with the cabinet can be improved, the mounting quality can be improved, and the shape of the color cap is unified. It is also possible to reduce the number of types.

  Hereinafter, the present invention will be described in detail based on Embodiment 1 of the present invention shown in the accompanying drawings.

1 is a front view of a wood screw according to Embodiment 1 of the present invention, FIG. 2 is a rear view of the wood screw, FIG. 3 is a left side view of the wood screw, and FIG. 4 is a right side view of the wood screw. 5 is a plan view of the wood screw, FIG. 6 is a bottom view of the wood screw, FIG. 7 is a sectional view taken along the line AA in FIG. 5, FIG. 8 is a sectional view taken along the line BB, and FIG. It is sectional drawing which shows a state.

  The wood screw 1 according to the first embodiment includes a large dish-shaped screw head 2 formed so as to have a diameter d2 that is twice or more the screw shaft diameter d1, and the screw head 2 and the screw shaft 3. And a plurality of ribs 5 (six strips in the first embodiment) projecting on the truncated cone-shaped inclined surface 4 formed between and a diameter d3 slightly larger than the shaft diameter d1 of the screw shaft portion 3. (D1 <d3 <d2) knurled blade-like knurl part 6, two thread threads 7 and 8 formed between the tip of threaded shaft part 3 and knurl part 6, and thread threads 7 and 8 The tip part 9 of the tip crack formed in the front-end | tip part.

  As described above, in the wood screw 1 according to the first embodiment, since the screw head 2 is configured to have the diameter d2 that is twice or more the screw shaft diameter d1, the holding force to the cabinet is increased. Since the diameter of the base portion of the screw shaft portion 3 can be increased, so-called jumping of the screw head portion 2 can be eliminated. The screw head 2 is formed with an engaging portion 10 such as a plus groove for engaging a rotary driving tool such as a screwdriver. In addition, since the wood screw 1 according to the first embodiment can be detachably fitted with the synthetic resin color cap C on the screw head 2, after the wood screw 1 is attached, the color cap C is By using the same color as the back plate B of the cabinet K, the screw head 2 can be concealed, the color uniformity with the cabinet K can be achieved, and the mounting quality can be improved. Of course, by unifying the shape of the color cap C, the types can be reduced, and the parts management can be simplified. In the first embodiment, it is desirable to project the protrusion 2A in the circumferential direction so that the cross-sectional shape of the screw head 2 increases the engagement force with the collar cap C.

Further, in the first embodiment, since the plurality of ribs 5 project from the truncated cone-shaped inclined surface 4 formed between the screw head 2 and the screw shaft portion 3, the idling of the wood screw 1 is prevented. In addition, it is possible to effectively prevent the screw head 2 from floating due to the seating action.

Furthermore, in the wood screw 1 of the first embodiment, the knurled blade-like knurled portion 6 having a diameter d3 slightly larger than the shaft diameter d1 of the screw shaft portion 3 is formed, as shown in FIG. When the back plate B of the cabinet K is fixed to the wall surface W, it is possible to reliably prevent the cabinet K from floating, that is, to generate a gap with the wall surface W.

In the knurled portion 6 according to the first embodiment, the knurled blade opens a large hole in the wood on the near side, so that the tightening torque is small, and the tightening operation between the woods can be lightened. In addition, the knurled portion 6 is long along the axial direction of the screw shaft portion 3 and has an uneven surface on the circumferential surface of the screw shaft portion 3 to reduce the contact surface with the wood. In addition to the shape of the knurled blade, a large number of vertical grooves may be formed on the outer peripheral surface of the screw shaft portion 3 along the circumferential direction. The knurled portion 6 is desirably formed in this manner because the resistance in screwing can be reduced by providing an inclination in the same direction as the threads 7 and 8.

Moreover, in the wood screw 1 of Example 1, the first screw thread 7 and the nominal diameter d5 smaller than the nominal diameter d4 of the first screw thread 7 were formed on the outer peripheral surface of the screw shaft portion 3. The second screw threads 8 are provided alternately as double lead screws from the bottom of the screw head 3 to the tip 9. Furthermore, the diameter is gradually reduced from the diameter d6 of the base of the first thread 7 to the diameter d7 of the base of the second thread 8. Moreover, the tip part 9 of the crack which is a drill blade is formed in the front-end | tip part. The tip of the tip of the tip 9 is cut into a substantially crescent shape at the tip of the threads 7 and 8, and the cross-sectional shape is formed in a substantially V shape. The bite is very good, and the chips cut by the rotation of the wood screw 1 are not easily compressed, and are smoothly discharged upward along the V-shaped surface.

Next, the state in which the wood screw 1 of the first embodiment is screwed into the wooden building material will be described. A rotational force is applied by the electric rotary tool so that the tip 9 of the wood screw 1 has a hole with a diameter of d8 in the wooden building material. Enter the interior of the wooden building material while opening the door. The first screw thread 7 and the second screw thread 8 alternately enter the side wall of the hole opened by the pointed tip 9 while forming a female screw. Since the diameter d8 of the pointed tip 9 is larger than the diameter d6 of the base of the first thread 7, the side wall of the hole, the first thread 7, the second thread 8, and each thread A gap surrounded by the valley is generated. Therefore, the cutting waste generated by cutting the pointed tip 9 is discharged through the gap to the outside of the hole.

Further, the first screw thread 7 that generates the fastening force of the wood screw 1 deeply bites into the side wall of the hole opened by the pointed tip 9. Since the diameter d6 of the base of the first screw thread 7 is formed larger than the diameter d7 of the base of the second screw thread 8 that bites into the side wall shallowly, each screw thread does not fit into the side wall. Since the screw is inserted without losing the resistance that is generated, the rate of catching on the wood increases and the pulling strength increases, so that the holding force of the wood screw 1 can be increased.

Thus, in the wood screw 1 of the first embodiment, the tip cracked tip 9 formed at the tip of the thread can provide an excellent pilot hole cutting function without clogging. Wood and wood-based interior materials and some new building materials, as well as hard wood with many vertical eyes and hard wood with knots, particle board solidified wood waste, compression board, gypsum board, aluminum plate, Even with various interior materials and building materials such as vinyl chloride plates, thin iron plates, or cement plates, cracking is unlikely to occur and workability can be improved. In addition, in this Example 1, although the wall surface W is comprised with the nonflammable material F arrange | positioned between the kitchen panel P and the attachment rail S, as shown in FIG. Of course, the present invention is not limited to this, and the present invention can also be applied to wall surfaces having various configurations.

Further, in the wood screw 1 according to the first embodiment, when the back plate B of the cabinet K is made of wood, the head 2 of the wood screw 1 slightly bites into the back plate B, and it is difficult to attach the color cap C. Therefore, as shown in FIG. 1, the height dimension H2 on the screw shaft side 2B is larger than the height dimension H1 on the screw hole opening side 2A of the screw head 2 (in this embodiment, H1 = 1. 1 mm <H2 = 1.6 mm), and the collar cap C is screwed by gently forming the inclination angle of the peripheral surface of the screw shaft portion side 2B with respect to the inclination angle of the peripheral surface of the screw hole opening portion side 2A. As shown in FIG. 9, it is desirable that the screw shaft portion side 2 </ b> B is formed so as to protrude beyond the bottom surface portion C <b> 1 of the collar cap C when the head portion 2 is fitted.

Since the wood screw 1 according to the first embodiment is configured as described above, when the cabinet K such as a sink or vanity is attached to the wall surface W, as shown in FIG. The portion 9 is cut and screwed in the order of the back panel B, the kitchen panel P, the non-combustible material F, and the mounting bar S. At this time, since the threads 7 and 8 bite into the incombustible material F and the mounting bar S, and the knurled part 6 bites into the frame material B1 and the kitchen panel P into the back plate B, the cabinet K is brought into the wall surface W by the holding power of these parts. Furthermore, since the plurality of ribs 5 projecting from the inclined surface 4 bite into the back plate B, the screw head 2 does not rise from the back plate B. Thereafter, the screw cap 2 of the screw head 2 can be concealed by fitting the collar cap C to the screw head 2.

  10 to 13 show a wood screw 1A according to Embodiment 2 of the present invention. The wood screw 1A according to Embodiment 2 is provided between a screw head 2 and the truncated cone-shaped inclined surface 4. Since the other components are the same as the wood screw 1 of the first embodiment except that the step portion D is formed, the same reference numerals as those used in the first embodiment are attached to the drawings, and a detailed description thereof is given. Is omitted here. The height of the step portion D is 0.3 mm in the second embodiment. When the height is higher than this, a gap is formed between the color cap C and the back plate B of the cabinet K, so the height is set to be approximately the same as the thickness (0.2 to 0.3 mm) of the color cap C. . Of course, in this invention, you may set the height of the step part D to 0.3 mm or more as needed.

Since the wood screw 1A according to the second embodiment is configured as described above, the screw head 2 does not bite into the back plate or the like of the cabinet even if the wood screw 1A is tightened too strongly with an electric screwdriver or the like. Since the clearance by the step portion D can be formed between the back plate and the screw head 2, the synthetic resin color cap can be securely attached.

It is a front view of the wood screw concerning Example 1 of this invention. It is a rear view of the same wood screw. It is a left view of the same wood screw. It is a right view of the same wood screw. It is a top view of the same wood screw. It is a bottom view of the same wood screw. FIG. 5A is a sectional view taken along line AA. FIG. 1B is a sectional view taken along line B-B. It is sectional drawing which shows the use condition of the same wood screw. It is a front view of the wood screw concerning Example 2 of this invention. It is a left view of the same wood screw. It is a right view of the same wood screw. It is explanatory drawing which expands and shows the step part of the same wood screw.

Explanation of symbols

B Back plate B1 Back plate frame part C Color cap D Step part F Noncombustible material K Cabinet P Kitchen panel S Mounting bar W Wall surface 1,1A Wood screw 2 Screw head 3 Screw shaft part 4 Frustum-shaped inclined surface 5 Rib 6 Nar Parts 7 and 8 Thread 9 Pointed tip

Claims (3)

  A platter-shaped screw head formed to have a diameter that is twice or more the screw shaft diameter, and a truncated cone-shaped inclined surface formed between the screw head and the screw shaft. A plurality of ribs, a knurled blade-shaped knurl portion formed slightly larger than the shaft diameter of the screw shaft portion, a thread formed between the tip portion and the knurl portion of the screw shaft portion, A substantially V-shaped pointed tip with a planar shape formed at the tip of the thread cut in a substantially crescent shape, wherein the thread includes a first thread and the first thread Are formed with double-lead screw threads in which second screw threads having a nominal diameter smaller than that of the first screw thread are alternately arranged, and the pointed tip part of the tip is a member to be fastened. After biting into the machine, it is formed so that the chips cut by the rotation are discharged without being compressed. Wood screws characterized by.   The wood screw according to claim 1, wherein a step portion is formed between the screw head and the truncated cone-shaped inclined surface. The wood screw according to claim 1 or 2, wherein a synthetic resin color cap is detachably fitted to the screw head.

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