JP6118592B2 - Protective fixing material for fastening screws - Google Patents

Description

  When fastening various members to a structure using a tapping screw, the present invention is for fastening a screw that can obtain a high pulling strength of the tapping screw by inserting it into a prepared hole in the structure. It relates to protective fixing materials.

  For example, when fixing various members using tapping screws to structures such as concrete, ALC (cellular concrete), mortar, gypsum board, thin steel plate, etc., insert the fixing material in the prepared holes in advance. Thus, a protective fastening material for fastening screws that can obtain high pull-out strength is used.

  The above-mentioned conventional fixing material is made of a material that can be tapped into the tapping screw thread. When the tapping screw is arranged in the lower hole of the structure into which the tapping screw is screwed, the width and lower part of the circumferential direction of the lower hole are covered. It has a length that fits in the hole, and the thickness in the width direction is a uniform cross-section arc shape, or a crescent-shaped cross section that becomes thinner as it approaches both ends, and its outer peripheral surface is in close contact with the inner peripheral surface of the lower hole It is a surface.

  In such a fixing material, by reducing the cross-sectional area of the lower hole, the thread of the tapping screw screwed into the lower hole is mechanically screwed and fixed to the inner peripheral surface of the lower hole. On the other hand, the screw thread bites into the inner peripheral surface side, and the outer peripheral contact surface is pressed against and fixed to the inner peripheral surface of the lower hole, so that a high pulling strength of the tapping screw can be obtained (for example, a patent Reference 1).

Japanese Patent No. 2502253

  By the way, in the use of the above-mentioned fixing material, the conditions for obtaining a predetermined pullout strength are affected by the relationship between the inner diameter of the pilot hole, the shaft diameter of the tapping screw, and the cross-sectional shape of the fixing material. The inner diameter of the pilot hole provided in the structure using a drill is a variable factor with respect to the tapping screw and fixing material, and the fluctuation of the inner diameter of the pilot hole affects the pulling strength of the tapping screw and the operability of the screwing operation. Become.

  In other words, a drill for drilling a pilot hole in a structure is selected and used for a tapping screw to be screwed in, with a drill diameter suitable between the thread diameter and the valley diameter. As the drill is used, the drill body gradually wears, and the inner diameter of the drilled hole becomes smaller along with this, and the small diameter change of the drilled diameter gradually changes. Is difficult.

  As a result, the diameter of the hole in the lower hole becomes the same or smaller than the valley diameter of the tapping screw without knowing it. If a fixing material is inserted into such a hole, the cross-sectional area of the lower hole will be larger than necessary. This reduces the compression force in the thickness direction of the fixing material from the beginning of screwing of the tapping screw into the lower hole, which becomes a large resistance element against screwing of the tapping screw, and makes the screwing operation of the tapping screw difficult.

  Also, when the tapping screw is screwed in, if the fixing material is compressed in the length direction and pushed back into the lower hole, the fixing material hardened in the back makes the tapping screw impossible to screw in or Even if this is the case, it becomes impossible to improve the pull-out strength generated by the fixing material.

  Furthermore, even when the lower hole has a perforation diameter in an appropriate range, when the tapping screw is screwed, the inner peripheral surface of the lower hole and the contact surface of the fixing material do not occur at an early stage of screwing. A rotating phenomenon occurs with the tapping screw in the fixing material, and when such a rotation occurs, a feed that causes the screw thread to move the fixing material in the length direction is generated. As a result, the fixing material is moved from the head of the tapping screw. There is also a problem of jumping out of the pilot hole.

  Therefore, the problem of the present invention is that even when the drilling diameter of the pilot hole is not only the appropriate dimension but also smaller than that, it does not become an excessive resistance element for screwing the tapping screw, and the screwing operation of the tapping screw is smooth. Therefore, it is possible to provide a protective fixing material for fastening screws, which can prevent the occurrence of rotation in the initial stage of screwing, and can always reliably obtain a strong pulling strength.

In order to solve the above-described problems, the present invention uses a material that can be tapped into a tapping screw thread, and is a plate-like or sheet-like fixing material that is disposed in a prepared hole of a member to be screwed into which the tapping screw is screwed. In the protective fixing material for fastening a screw formed with a width that covers a part of the lower hole in the circumferential direction and a length that fits in the lower hole, the non-adhering portion is in contact with the inner peripheral surface of the lower hole of the fixing material main body. Is provided over the entire length of the fixing material main body with the contact surfaces left on both sides, and the portion provided with the non-adhesive portion of the fixing material main body is between the inner peripheral surface of the pilot hole when the tapping screw is screwed in. Escape into the formed space, widen the gap of the part where the tapping screw enters the pilot hole, and become a thin-walled part that reduces excessive work as a resistance element of the fixing material when the tapping screw is screwed in. Width of part When the tapping screw is screwed in, the corner formed by the both side ends located on the side and the contact surface is the starting point for moving the both side parts sandwiching the non-adhered part of the fixing material body in the direction of biting into the thread of the tapping screw. It is set as the structure used as the hinge part which becomes .

The fixing member main body, and an outer contact surface to be arcuate, is formed in a curved shape in cross section with the arcuate threads biting surface located inside the contact surface, the non-adhesion portion is, circumference of the contact surface It is formed by either a flat surface in which a part along the direction is flattened or a recessed groove in which a part along the circumferential direction of the contact surface is recessed.

The cross-sectional shape of the fixing material main body is such that two non-adhering portions are provided at the center position of the width so that two side portions are located on both sides thereof, and the two side portions are different in thickness. be able to.

  Here, the fixing material main body is made of a synthetic resin that can bite into the thread of the tapping screw. For example, a long object extruded into a predetermined cross-sectional shape is cut to a length that fits in the prepared hole. By forming, there is an advantage that a product having a certain dimensional accuracy can be easily mass-produced.

According to the present invention, the non-contact portion is provided over the entire length of the fixing material main body with the non-contact portion remaining on both sides of the contact surface with respect to the inner peripheral surface of the lower hole of the fixing material main body, and the non-contact portion of the fixing material main body is provided. When the tapping screw is screwed, it escapes into the space formed between the inner peripheral surface of the pilot hole and widens the gap of the part where the tapping screw enters the pilot hole. When the tapping screw is screwed into the corners formed by the both side ends located in the width direction of the non-contact part and the contact surface, the fixing material is reduced. Since both side portions sandwiching the non-contact portion of the main body are hinge portions that serve as starting points for moving in the direction of biting into the thread of the tapping screw, the non-contact portion is a space between the inner peripheral surface of the pilot hole. Will ensure When screwed tapping screw, the thin thickness portion can escape pushed into the space, to reduce the excessive action of the resistive elements during the tapping screw screwing, thereby, perforation diameter of the lower hole of the proper size Even if the lower limit or smaller, the tapping screw thread bites into the inner peripheral surface of the lower hole and the fixing material, and at the same time, the contact force of the troughs is relaxed, and at the same time, it is closely fixed to the inner peripheral surface of the lower hole. As a result, the improvement of the pulling strength by the fixing material main body is always obtained.

  In addition, the non-contact part provided on the contact surface becomes a hinge to give elasticity to both sides in the width direction of the fixing material body, and when the tapping screw is screwed, the contact surfaces on both sides are made to the inner peripheral surface of the lower hole. By facilitating contact, the fixing material can be pressed against the inner peripheral surface of the lower hole at an early stage of screwing, thereby suppressing the occurrence of a rotating phenomenon of the fixing material body and preventing the fixing material from popping out. be able to.

  Furthermore, in the cross-sectional shape of the fixing material main body, the thickness of both sides of the center line in the width direction is different, so that when tapping screws are screwed in, the screw threads quickly bite into the thicker side. As a result, the fixing material main body is not compressed in the length direction with the tapping screw, and the occurrence of the rotating phenomenon of the fixing material main body is suppressed, and the protrusion from the lower hole is prevented. be able to.

The longitudinal cross-sectional view which shows the fastening state by the tapping screw using the fixing material which concerns on this invention An enlarged cross-sectional plan view showing the relationship between the state of incorporation of the fixing material of the present invention into the prepared hole and the thread of the tapping screw (A) thru | or (e) is a perspective view which shows the 1st thru | or 5th example of a fixing material in order. (A) is an enlarged cross-sectional plan view showing a first example of a fixing material, (b) is an enlarged cross-sectional plan view showing a second example of the fixing material, and (c) is an enlarged view showing a fifth example. Transverse plan view

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

    FIG. 1 shows an example of a fastening structure using a screw fastening protective fixing material 1 (hereinafter simply referred to as a fixing material) according to the present invention, such as concrete, ALC (cellular concrete), mortar, gypsum board, thin iron plate, etc. The structure (screwed member) 2 is provided with a lower hole, and various members 5 are fixed to the structure 2 with a tapping screw 4 screwed into the lower hole 3. As shown in FIG. The material 1 is provided in the shaft portion 4a of the screwed tapping screw 4 by inserting the material 1 into the lower hole 3 of the structure 2 in advance when the tapping screw 4 is screwed, and reducing the cross-sectional area in the lower hole 3. With a fixing force that causes the screw thread 4b to bite into the inner peripheral surface of the lower hole 3, and at the same time, a fixing force that causes the fixing material 1 that the screw thread 4b bites into the inner peripheral surface of the lower hole 3 to be pulled out. Can get strength It is Unisuru thing.

  The prepared hole 3 provided in the structure 2 is formed by a drill having an outer diameter located between the root diameter of the shaft portion 4a of the tapping screw 4 used for fastening and the thread diameter of the screw thread 4b. By using a drill having an upper limit value of the appropriate drilling diameter, even if the drilling diameter decreases due to wear of the drill body, it can be used for many drilling operations.

  Further, by setting the drilling diameter of the lower hole 3 by the drill to an upper limit value larger than the valley diameter, the amount of biting of the screw thread 4b with respect to the inner peripheral surface of the lower hole 3 is reduced. By inserting in the lower hole 3, the cross-sectional area in the lower hole 3 is reduced, so that the amount of thread 4b biting into the inner peripheral surface of the lower hole 3 is secured, and at the same time the fixing material 1 is 3 to obtain a high pulling strength of the tapping screw 4.

3 and 4 show the fixing material 1 of the present invention, in which the fixing material main body 1a using a material such as a synthetic resin or rubber capable of biting into the thread 4b of the tapping screw 4 is screwed into the tapping screw 4. When inserted into the lower hole 3 of the body 2, it has a cross-sectional shape with a width that covers a part of the lower hole 3 in the circumferential direction, and is formed in a plate shape having a length that fits in the lower hole 3.

As shown in FIGS. 3A to 3E, the fixing material main body 1a forming the fixing material 1 is formed in a cross-sectional shape like a substantially semi-cylindrical shape having a predetermined plate thickness, and has an outer arcuate surface. However, it becomes a close contact surface 1b that comes into contact with the inner peripheral surface of the lower hole 3 when inserted into the lower hole 3 with a curvature that is commensurate with the inner periphery of the lower hole 3, and a small-diameter inner arc-shaped surface becomes a thread biting surface 1c. Both ends in the width direction are ends of arcs or straight lines.

In the fixing material main body 1a forming the fixing material 1, a non-contact portion 1d with respect to the inner peripheral surface of the lower hole 3 is formed in a part of the arc-shaped contact surface 1b in the circumferential direction. The fixing member main body 1a is provided over the entire length in the length direction.

3 (a) to 3 (e) show some examples of the non-contact portion 1d provided on the fixing material main body 1a, and FIGS. 4 (a) to 4 (c) are enlarged sectional views of typical examples. It shows.

3 (a) and 4 (a) show a first example of the non-contact portion 1d, which is formed by providing a flat portion at the center position in the width direction in the cross section of the contact surface 1b.

3 (b) and 4 (b) show a second example of the non-contact portion 1d, and a part of the contact surface 1b is recessed at the center position in the width direction in the cross section of the contact surface 1b. It is formed by providing a shallow arc-shaped groove-like portion that is a concave groove.

FIG. 3C shows a third example of the non-contact portion 1d, which is a deep groove that is a recess groove in which a part of the contact surface 1b is recessed at the center position in the width direction in the cross section of the contact surface 1b. It is formed by providing an arcuate groove.

FIG. 3D shows a fourth example of the non-contact portion 1d, which is an opening that is a recessed groove in which a part of the contact surface 1b is recessed at the center position in the width direction in the cross section of the contact surface 1b. It is formed by providing a narrow V-shaped groove.

FIGS. 3 (e) and 4 (c) show a fifth example of the non-contact portion 1d, in which a part of the contact surface 1b is recessed at the center position in the width direction in the cross section of the contact surface 1b. This is formed by providing a V-shaped groove portion having a wide opening, which is a concave groove.

In addition, although illustration was abbreviate | omitted, a U-shaped groove | channel can be mentioned as other cross-sectional shape of the non-contact | adherence part 1d.

In any non-contact portion 1d of any of the examples described above, the cross-sectional shape of the fixing material 1 is such that the thickness of the portion where the non-contact portion 1d is provided is thinner than the both side portions 1f sandwiching the non-contact portion 1d. For this reason, the thin thickness part 1e in the center position of the width direction turns into an elastic bendable part with sufficient bendability.

Further, in the fixing material main body 1a, in any example of the non-contact portion 1d, the corner portion formed by the both side ends positioned in the width direction of the non-contact portion 1d and the arc-shaped contact surface 1b is the tapping screw 4. This is a hinge portion a that serves as a starting point for causing movement in the direction of biting into the thread 4b of the tapping screw 4 to both side portions 1f sandwiching the non-adhering portion 1d of the fixing material main body 1a.

The fixing material 1 is made of a synthetic resin that can be penetrated by the thread 4b of the tapping screw 4, and an elongated object having the cross-sectional shape shown in FIGS. 3A to 3E is extruded and molded. If this long object is formed by sequentially cutting to a length that can be accommodated in the lower hole 3, the fixing material 1 having a constant cross-sectional shape and dimensional accuracy can be easily mass-produced.

The cross-sectional shape of the fixing member 1 is such that the two side portions 1f are substantially symmetrical with respect to the center line X in the width direction shown in the first example of FIG. 4A. The thickness of the fixing material main body 1a can be set such that the thicknesses of the two side portions 1f are slightly different across the center line X. The difference in thickness is that the entire thickness of the side portions 1f is mutually different. It is possible to adopt a structure that is different from each other or that a part having a partial thickness difference is provided in the middle of one.

In addition, the cross-sectional shape and form of the fixing material 1 are not limited to the semi-cylindrical plate shape as shown in FIGS. 3 and 4 as the first to fifth examples. What is necessary is just to set a shape, a width | variety, and thickness according to the shaft diameter of the tapping screw 4 used in combination, such as a sheet form and flat form, on the conditions which satisfy | fill the width | variety which covers a part of circumferential direction, and the length settled in the lower hole 3. In addition, the fixing material 1 may be prepared in a plurality of types having different sizes depending on the types of the tapping screws 4 having different shaft diameters.

Further, when the non-contact surface 1d of each of the above examples is formed by an arc-shaped groove-shaped portion or a V-shaped groove-shaped portion, by selecting the depth and opening width, the non-contact surface 1d when the tapping screw 4 is screwed in is selected. The amount of relief of the contact surface 1d and the flexural elasticity of both sides across the central axis X of the fixing material 1 can be arbitrarily set. For example, as in the fifth example shown in FIGS. 3 (e) and 4 (c), When the non-contact surface 1d is formed by a V-shaped groove portion with a wide opening width, the thin-walled portion 1e can be made thin to set a wide interval between the hinge portions a on both sides, and a large escape amount of the non-contact portion 1d can be secured. Not only can the mobility of both side portions 1f starting from the hinge portion a be improved.

  The screw fixing material 1 according to the present invention is configured as described above. Next, a method of using the fixing material 1 will be described.

  When fixing various members 5 to the structure 2, a tapping screw 4 having a shaft diameter capable of obtaining a necessary fixing strength and a drill for drilling a prepared hole 3 corresponding to the shaft diameter of the tapping screw 4. A tool 1 and a fixing material 1 corresponding to the shaft diameter of the tapping screw 4 are prepared.

  First, a lower hole 3 having a predetermined inner diameter and depth is drilled with a drill of a drilling tool at a position where various members 5 of the structure 2 are fixed, and then the fixing material 1 is inserted into the lower hole 3. As shown in FIG. 2, the contact surface 1 b is set along the inner peripheral surface of the lower hole 3.

  Next, various members 5 are stacked on the portion where the lower hole 3 of the structure 2 is provided, the mounting holes 5a provided in the various members 5 are aligned with the lower holes 3, and the tapping screws 4 are inserted into the mounting holes 5a. Screw the screw 4 toward the pilot hole 3.

  The inner hole of the lower hole 3 is narrowed by the thickness of the fixing material 1, and the tapping screw 4 that has entered the lower hole 3 from the tip of the lower hole 3 has an exposed portion of the inner peripheral surface of the lower hole 3. The thread 4b of the tapping screw 4 will bite into the thread biting surface 1c of the fixing material 1 and the height of the thread 4b of the tapping screw 4 with respect to the exposed portion of the inner peripheral surface of the lower hole 3 due to the presence of the fixing material 1. At the same time, it bites into the thread biting surface 1c of the fixing member 1 and presses and fixes the contact surface 1b to the inner peripheral surface of the lower hole 3.

  In this way, the tapping screw 4 bites into the thread 4b between the inner peripheral surface of the lower hole 3 and the fixing member 1, and the fixing member 1 eliminates a gap between the shaft portion 4a and the inner peripheral surface of the lower hole, and is fixed at the same time. Since the close contact surface 1b of the material 1 is press-fixed to the inner peripheral surface of the lower hole 3, it is possible to obtain a high pulling strength without the occurrence of loosening or idling with respect to the structure 2, and various members 5 are attached to the structure 2. It can be firmly fixed.

  Since the fixing member 1 is formed using an elastic material such as a synthetic resin or rubber that can be screwed into the tapping screw 4, the fixing member 1 protects the thread 4b of the tapping screw 4 and is made of a material that is easily broken. There is also a function of protecting the structure 2.

  Here, when the inner diameter of the lower hole 3 is close to the lower limit of the appropriate range with respect to the shaft diameter of the tapping screw 4, the inner space of the lower hole 3 becomes narrower than necessary due to the insertion of the fixing material 1, as described above. The tapping screw 4 that has entered the narrowed lower hole 3 bites into the exposed portion of the inner peripheral surface of the lower hole 3 and the thread biting surface 1c of the fixing member 1, The tapping screw 4 compresses the fixing material 1 excessively by the amount that the inside of the pilot hole 3 is narrow due to the small diameter.

  At this time, the fixing material 1 has a cross-sectional shape in which the non-contact portion 1d is provided on the contact surface 1b joined to the inner peripheral surface of the lower hole 3, so A space is secured between the portions 1d, and the remaining portion with respect to the non-contact portion 1d is a thin-walled portion 1e. Therefore, when the tapping screw 4 is screwed, the thin-walled portion 1e is pushed into the space. As a result, the gap in the portion of the lower hole 3 where the tapping screw 4 enters becomes wider, thereby reducing the excessive function as the resistance element of the fixing member 1 when the tapping screw 4 is screwed. Even when the perforated diameter is lower than the lower limit of the appropriate dimension or smaller than that, the thread 4b of the tapping screw 4 can bite into the inner peripheral surface of the lower hole 3 and the fixing material 1 to reduce the contact force of the trough. At the same time, the contact surface 1b of the fixing material 1 is the inner periphery of the lower hole 3 A it will be pressed against fixed, which makes it possible to improve the pull-out strength can be obtained at all times by the stationary member 1.

  Further, the fixing member 1 has a structure having elasticity on both sides in the width direction by the thin-walled portion 1e by the non-contact portion 1d provided on the contact surface 1b, and in the width direction across the non-contact portion 1d. Since the corner portions on both sides are hinge portions a, when the thin wall portion 1e is pushed away by the screwed tapping screw 4, the hinge portions a that contact the inner surface of the lower hole 3 are used as starting points. 1f tries to move in a direction to bite into the thread 4b of the tapping screw 4, and therefore, when the tapping screw 4 is screwed in, the contact surfaces 1b on both sides are easily pressed against the inner peripheral surface of the lower hole 3, The tapping screw 4 can be securely screwed into the fixing material 1, and the fixing material 1 can be pressed and fixed to the inner peripheral surface of the lower hole 3 at an early stage of screwing to suppress the occurrence of the rotating phenomenon. Fixed material 1 flies It is possible to prevent the occurrence of a situation, such as out.

  Furthermore, in the cross-sectional shape of the fixing member 1, the thickness of the both side portions 1 f with the center line X in the width direction as the boundary is different, so that when the tapping screw 4 is screwed, the thin side has a wide gap. As a result, the tapping screw 4 can easily enter, and the screw thread 4b can quickly bite into the thicker side and be brought into pressure contact with the inner peripheral surface of the lower hole 3. Is not pushed more than necessary in the length direction, so that the fixing material 1 is not squeezed into the depth of the lower hole 3 and the occurrence of the rotating phenomenon of the fixing material 1 is suppressed and the protrusion from the lower hole 3 is prevented. Can be prevented.

DESCRIPTION OF SYMBOLS 1 Fixing material 1a Fixing material main body 1b Contact surface 1c Thread bite surface 1d Non-contact part 1e Thin wall part 1f Both sides a Hinge part 2 Structure 3 Lower hole 4 Tapping screw 4a Shaft part 4b Thread 5 Various members

Claims (3)

A width that covers a part of the plate-shaped or sheet-shaped fixing material body that is placed in the lower hole of the member to be screwed into which the screw thread of the tapping screw can be screwed and covers the circumferential part of the lower hole. In the protective fixing material for fastening the screw formed in a length that fits in the lower hole, the fixing material main body with the non-adhering portion left on the both sides of the non-adhering portion on the inner peripheral surface of the lower hole of the fixing material main body The part provided with the non-adhesive part of the fixing material body escapes into the space formed between the inner peripheral surface of the lower hole by being pushed with the tapping screw when the tapping screw is screwed in, The gap in the part where the tapping screw enters in the lower hole is widened, and it becomes a thin-walled portion that reduces excessive function as a resistance element of the fixing material when the tapping screw is screwed in, and is located in the width direction of the non-contact portion Both When the tapping screw is screwed into the corner formed by the end and the contact surface, the hinge is the starting point for moving both sides of the non-adhesive part of the fixing material body in the direction of biting into the thread of the tapping screw. A protective fixing material for fastening screws, characterized in that The fixing member main body, and an outer contact surface to be arcuate, is formed in a curved shape in cross section with the arcuate threads biting surface located inside the contact surface, the non-adhesion portion is, circumference of the contact surface 2. The screw according to claim 1, wherein the screw is formed by either a flat surface in which a part along the direction is flattened or a recessed groove in which a part along the circumferential direction of the contact surface is recessed . Protective fixing material for fastening. The cross-sectional shape of the fixing material body is characterized in that a non-adhesive portion is provided at the center position of the width so that two side portions are located on both sides, and the thicknesses of the two side portions are different. A protective fixing material for fastening screws according to claim 1 or 2.

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