JP2010156438A - Anchor for gypsum board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor in which a rib is surely broken, since in an anchor having four legs with adjacent legs thereof coupled by a rib or the like, a screw does not get in between the two legs coupled by the rib and the rib does not break. <P>SOLUTION: The anchor includes a head at its base end, a boring blade at its end, and external threads formed on the periphery of a body defined therebetween. Four split grooves are provided on the body from its end side toward the base end to form four legs, and the four dividing grooves, when viewed from the axial direction, form a cruciform. A temporary connection section is stretched between ends of two legs which are point symmetrical with respect to the axis, and the boring blade is mounted on the temporary connection section. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an anchor for a gypsum board mainly used in construction.

  A conventional anchor for gypsum board in which the body part is divided into four parts to form four legs, and the inner surfaces facing each other in a split groove between two adjacent legs are partly formed One rib to be connected is provided, and another pair of legs is also provided with one rib in the same manner.

  Thus, since the conventional anchor has four legs and the rib is provided in the split groove, the tip of the anchor has a pointed tip of the four legs. Therefore, when the anchor is screwed into the board at the time of use, the four sharp tips of the legs hit the board and get caught, so that the anchor is difficult to enter the board. In addition, one set of legs is connected by one rib, and the other set of legs is also connected by one rib. The one set of legs and the other set of legs are ribs. Not joined. Therefore, when a relatively thin screw is screwed in after the anchor is screwed into the board, the pair of legs and the other pair of legs are not joined by the ribs, so they can be easily spread, but they are joined by the ribs. Since there is no structure in which the screw enters between the two legs, the ribs are not broken and the legs may not be completely opened.

JP 2007-100180 A Registered Utility Model No. 3009696

  The problem to be solved is that when an adjacent leg is coupled with a rib or the like in an anchor having four legs, a screw does not enter between the two legs coupled with the rib, so that the rib does not break. There is a fear.

  Claim 1 of the present invention has a head at the base end, a perforation blade at the tip, a male screw is formed on the outer periphery of the barrel between them, and the four split grooves are closer to the tip of the barrel. The four leg portions are formed by providing from the base end direction to the base end direction, and the four split grooves are formed in a cross shape when viewed from the axial direction, and are temporarily connected to the distal end portions of the two leg portions that are point-symmetric with respect to the axis. The temporary connecting portion is provided with the drilling blade, and the temporary connecting portion can be cut when the legs are opened.

  The second aspect of the present invention is an element in which the distal ends of the two free end leg portions where the temporary connection portion is not formed are closer to the proximal end than the distal ends of the two leg portions where the temporary connection portion is formed. This is a configuration added to 1.

  According to a third aspect of the present invention, the tip space portion adjacent to the temporary connection portion between the two leg portions where the temporary connection portion is formed is closer to the tip of the anchor than the tips of the two free end legs. The element located and exposed at the position is added to claim 2.

  According to a fourth aspect of the present invention, there is provided a leg portion having a cross section formed into a sector shape by a split groove having a cross shape, and the top portion of the sector shape of the two leg portions where the temporary connection portion is formed is chamfered at least in the range of the tip space portion The elements are added to claim 3.

According to a first aspect of the present invention, four leg portions are formed by providing four split grooves from the front end to the base end of the body portion, and the four split grooves form a cross shape when viewed from the axial direction. A temporary connecting portion is bridged over the tip portions of two leg portions that are point-symmetric, and the drilling blade is provided in the temporary connecting portion, and the temporary connecting portion can be cut when the legs are opened. Accordingly, the two leg portions on which the temporary connection portions are formed are positioned so as to face each other with the axis line as the center. Thus, when the screw is screwed into the anchor attached to the gypsum board, the screw enters between the two leg portions and applies pressure in a direction to release the both leg portions, so that the temporary connection portion is surely cut. The drawing of the registered utility model No. 3009696 discloses an anchor having two leg portions and a temporary connecting portion between them, and the specification shows a pitch of 90 degrees when the slit portion is viewed from the axial direction. And the provisional connection portion is provided in each slit portion. However, the present invention does not disclose a structure in which a temporary connecting portion is bridged between the tip ends of two legs that are point-symmetric with respect to the axis, and the present invention has four legs. The anchor which can cut | disconnect a temporary connection part reliably can be provided.

According to a second aspect of the present invention, the distal ends of the two free end leg portions where the temporary connection portion is not formed are closer to the proximal end than the distal ends of the two leg portions where the temporary connection portion is formed. Therefore, since the anchor is screwed into the gypsum board by the drilling of the drilling blade provided in the temporary connecting portion, and the free end leg portion does not interfere with the drilling of the drilling blade, the drilling can be performed smoothly.

According to a third aspect of the present invention, the tip space portion adjacent to the temporary connection portion between the two leg portions where the temporary connection portion is formed is closer to the tip of the anchor than the tips of the two free end legs. Is located and exposed. Therefore, when the anchor is screwed into the gypsum board, the scraped gypsum particles are taken in the tip space part while repeating the inflow and outflow sequentially, so the amount of particles entering the hollow part of the anchor is reduced and the screw is screwed in. Can be performed smoothly.

According to a fourth aspect of the present invention, there is provided a leg portion having a cross section formed into a fan shape by a split groove having a cross shape, wherein the top portion of the fan shape of the two leg portions where the temporary connection portion is formed is chamfered at least in the range of the tip space portion Has been. The anchor is tapered, and the hollow portion for screwing the screw is also formed very thin near the tip. Therefore, when the screw is screwed into the anchor, it may be harder than necessary and cannot be screwed smoothly, but the screw can be screwed smoothly by chamfering the corners of the legs. In addition, since the chamfer is chamfered at least in the range of the tip space portion, the width of the tip space portion is widened by the chamfering, so that more scraped gypsum particles can be taken in.

FIG. 1 is a front view of the present invention. FIG. 2 is a side view of the present invention. FIG. 3 is a view of the present invention as seen from the front end side. 4 is an enlarged cross-sectional view taken along line AA in FIG. FIG. 5 is an enlarged cross-sectional view taken along the line BB in FIG.

  Next, an embodiment of the present invention will be described. The anchor 1 is hollow and is integrally formed of plastic. It has a head 2 at the proximal end and a drilling blade 3 at the distal end. A male screw 5 is formed on the outer periphery of the body 4 between them. As shown in FIG. 1, two split grooves 6, 7 are provided from the front end of the body 4 viewed from the front toward the base end. One split groove 6 is shallower than the other split groove 7. Further, as shown in FIG. 3, split grooves 8 and 9 are also provided on the back side of the body 4. One split groove 8 is shallower than the other split groove 9. The depths of the dividing groove 6 and the dividing groove 8 are substantially the same, and the depths of the dividing groove 7 and the dividing groove 9 are substantially the same. The split groove 6 and the split groove 8 are connected in a straight line, and the split groove 7 and the split groove 9 are also connected in a straight line. When the anchor 1 is viewed from the axial direction as shown in FIG. The groove has a cross shape.

  Four leg portions 10, 11, 12, 13 are formed by providing split grooves 6, 7, 8, 9 in the body portion 4. A temporary connection portion 14 is bridged between the distal end portion 16 of the leg portion 11 and the distal end portion 17 of the leg portion 13. The central portion 15 of the temporary connecting portion 14 has an elliptical cross section, and the tip of the central portion 15 is formed on the sharp drilling blade 3. Since the temporary connecting portion 14 needs to be finally cut, the temporary connecting portion 14 has a portion formed as thin as about 0.5 mm.

  Since the leg portions 10 and 12 to which the temporary connecting portion 14 is not stretched are the distal ends 18 and 19 are free ends, these leg portions 10 and 12 are hereinafter referred to as free end leg portions. The free end legs 10 and 12 have a shape as if the tips of the legs 11 and 13 are cut. Therefore, the tips 18 and 19 of the free ends 10 and 12 are more than the tips 16 and 17 of the legs 11 and 13. Is also located near the base. As a result, the tip space portion 20 that is the space between the leg portions 11 and 13 and that is adjacent to the temporary connection portion 14 is exposed without being blocked by the free end leg portions 10 and 12.

  The tip space 20 exhibits a great effect when used. That is, when the drilling blade 3 is applied to the gypsum board and the anchor 1 is rotated with a screwdriver, particles are produced by the drilling blade 3 scraping the gypsum. If this enters the space of the anchor 1, the screw cannot be screwed smoothly when the anchor 1 is attached to the gypsum board and the screw is screwed. By providing the tip space portion 20, the scraped gypsum particles are taken in the tip space portion while sequentially repeating the inflow and outflow, so that the amount of particles entering the hollow portion of the anchor is reduced and screw screwing is smoothly performed. Can be done.

  As shown in FIG. 4, chamfered surfaces 21 and 22 are formed by chamfering the top portions of the leg portions 11 and 13 having a sectoral cross section. The width of the tip space 20 is increased by the amount of the chamfered portion, so that more scraped gypsum particles can be taken in. The chamfered surfaces 21 and 22 extend to the positions of the shallow bottom grooves 6 and 8. Further, as shown in FIG. 3, chamfered surfaces 23 and 24 are also formed on the free end leg portions 10 and 12. The chamfered surfaces 23 and 24 also extend to the bottom of the shallow split grooves 6 and 8.

Although not shown, the head 2 is formed with an engaging portion of an electric screwdriver, and the tip of the electric screwdriver can be engaged so that the anchor 1 can be rotated and screwed into the gypsum board.

  Next, a method of using the present invention will be described. The case where it uses for a thin gypsum board whose thickness is 9.5 mm is demonstrated. The drilling blade 3 of the anchor 1 is placed on the gypsum board, the tip of the electric screwdriver is engaged with the engaging portion of the head, and the anchor 1 is fully screwed into the gypsum board. A part of the trunk portion 4 of the anchor 1 screwed in penetrates from the back surface of the gypsum board. And the extent of the penetration is such that the groove bottoms of the deep split grooves 7 and 9 slightly come out from the back surface of the gypsum board. In this state, neither the deep dividing grooves 7 and 9 nor the shallow dividing grooves 6 and 8 are expanded.

  Next, the screw is screwed into the body 4 from the head 2. Then, the temporary connection part 14 is cut by the pressure of the screw, and the leg parts 11 and 13 and the leg parts 10 and 12 are opened. When the anchor is used for a relatively thick gypsum board having a thickness of 12.5 mm, the degree of penetration of the anchor 1 screwed into the gypsum board from the gypsum board is such that the shallow bottom grooves 6 and 8 are formed on the gypsum board. To some extent on the same plane as the back. In this case as well, the temporary connecting portion 14 is finally cut by the pressure of the screws by the same usage method as the thin gypsum board described above, and the leg portions 11 and 13 and the leg portions 10 and 12 are opened.

  Among the four legs formed by the four split grooves, a severable temporary connecting portion is bridged at the tip of the two legs that are point-symmetric with respect to the axis, so that when the screw is screwed into the anchor, The connecting portion can be reliably cut.

DESCRIPTION OF SYMBOLS 1 Anchor 2 Head 3 Drilling blade 4 Body part 5 Male screw 6 Split groove 7 Split groove 8 Split groove 9 Split groove 10 Free end leg part 11 Leg part 12 Free end leg part 13 Leg part 14 Temporary connection part 15 Central part 16 Tip portion 17 Tip portion 18 Tip 19 Tip 20 Tip space portion 21 Chamfered surface 22 Chamfered surface 23 Chamfered surface 24 Chamfered surface

Claims (4)

An anchor for a plasterboard formed in a hollow shape, having a head at the proximal end, a perforated blade at the distal end, and a male screw formed on the outer periphery of the trunk between the four split grooves Are provided from the front end of the body part to the base end direction, so that four leg parts are formed. When viewed from the axial direction, the four split grooves form a cross shape, and the two leg parts that are point-symmetric with respect to the axial line are formed. An anchor characterized in that a temporary connecting portion is stretched over a distal end portion, the drilling blade is provided in the temporary connecting portion, and the temporary connecting portion can be cut when the leg is opened. The tip of two free end leg parts which are legs in which a temporary connection part is not formed exists near the base end rather than a tip part of two legs in which a temporary connection part is formed. anchor.   The space between the two leg portions where the temporary connection portion is formed, and the tip space portion adjacent to the temporary connection portion is located closer to the anchor tip than the tips of the two free end legs, and is exposed. The anchor according to claim 2.   A leg portion having a cross section formed into a sector shape by a split groove forming a cross shape, and the top portion of the sector shape of the two leg portions where the temporary connection portion is formed is chamfered at least in the range of the tip space portion. Item 4. The anchor according to item 3.