JP2008175378A - Fixing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a screw thread can destroy the wall face or the like made of a brittle material and a screw is idly turned by a rotating torque caused at the time of pressing a metal fitting of a building with a head of the screw if the metal fitting part is tightened by rotating the screw. <P>SOLUTION: When the shortest distance from the center of a screw hole to the edge of the metal fitting is set to L1 and the thickness of the metal fitting to T1, the smaller penetration hole than a screw thread diameter which is made of a metal plate with an optionally-shaped outside diameter and the platy hollow part are prepared. The fixing unit consisting of a screw fixing auxiliary device 1 with the hanging down projection in the same direction as a pan-like hollow part and a screw body into a penetration hole are obtained on the outer circumference of the metal plate which the distance L2 from the center of the penetration hole in the distance exceeds L1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a means for fixing a metal fitting attached to a wall surface of a building, and more particularly to a fixing means when a material such as a wall surface is soft or has a low density.

  In general, as a means for fixing a metal fitting to a wall surface of a building or the like, a method using a screw having a head at one end of a shaft-like body and a screw thread on the shaft-like body is generally known and practiced.

In the case of a wooden wall, etc., the above screws are often used alone. However, if the screw is a material that does not function effectively, such as concrete, a plastic plug called a “plug” is pre-opened on the wall. A method of inserting into a hole and then fixing with a screw is generally known and practiced.
Japanese Patent Laid-Open No. 9-79239 Japanese Patent Laid-Open No. 10-196633

  If the material such as the wall of the building is reasonably hard like normal wood and has resilience, it is a screw alone, and if it is sufficiently dense and hard like normal concrete, by using a plug together, It is possible to fix the metal fittings that can be attached to the wall of the building without any problems.

  However, if the material such as the wall of the building is soft or coarse, for example, if it is a foamed material or a material with a structure with many small cavities inside, the screw can be rotated to If you try to tighten the metal fittings that are attached to the wall surface, there is a problem that the screw thread breaks the material due to the large torque that is applied at the time of final tightening that holds the metal fittings attached to the wall surface of the building with the head of the screw, and the screw runs idle .

  Even when plugs are used together, if the material is foamed concrete or block-shaped material with many cavities inside, the plug integrated with the screw by the large rotational torque applied at the time of final tightening of the screw is the material. Or slipping between the plug and the material, causing the wheel to slip, causing the plug to slip and scraping the plug itself and the material, creating a gap that prevents the metal fittings that are attached to the wall of the building from being securely fixed. There's a problem.

  Further, as disclosed in Patent Document 1, an invention has been made to give the plug itself a function of preventing idling. However, when a material such as a wall surface of a building is particularly brittle, the idling of the plug itself is prevented. It becomes difficult.

  In order to prevent these problems from occurring, it is necessary to immediately stop the rotation of the screw at the stage when the metal fitting to be attached to the wall surface of the building is sufficiently pressed against the wall material.

  Specifically, it is required to stop the rotation of the tool such as a screwdriver, but in recent years, the electrification and strengthening of the tools are progressing, so the subtle feeling at the final tightening of the screw can be felt and the rotation can be performed. It is difficult to stop.

  When the distance between the center and the shortest end of the threaded hole for screw insertion provided on the metal fitting attached to the wall of the building is L1, and the thickness of the metal fitting is T1, the outer shape is an arbitrary circle. It is made of a plate-like metal plate such as a polygonal shape, and a flat through hole having a circular diameter smaller than the screw thread diameter and a dish-like depression around the through hole are provided on the flat surface. Screw fixing assisting tool having a protrusion hanging at approximately the same length as T1 in the same direction as the dish-shaped depression at at least one point on the outer periphery of the metal plate at a distance L2 from L1 exceeding L1 and its through hole A fixing device comprising a screw body in which a sharp tip of a shaft portion is inserted and screwed and a screw thread of the shaft portion is formed just below a head provided at a terminal end of the shaft portion.

Next, an embodiment of the present invention will be described with an example illustrated.
FIG. 2 shows an example of a metal fitting attached to the wall surface of the building, and the length to the center and the shortest end 13 of the threaded through hole 12 for screw insertion provided in the metal fitting 11 attached to the wall surface of the building. When the thickness is L1 and the thickness of the metal fitting is T1, as shown in FIG. 1, the present invention is made of a plate-like metal plate having an arbitrary outer shape such as a circle or a polygon. A circular through-hole 2 having a diameter smaller than the thread of the screw and a dish-like depression 3 around the through-hole 2, and the outer circumference of the metal plate having a distance L2 from the center of the through-hole 2 exceeding L1 The screw fixing assisting tool 1 having a protrusion 4 that hangs in the same direction as the T1 in the same direction as the dish-shaped depression at at least one point on the upper side, and the through hole 2 has a pointed shaft. Directly under the head where the tip is inserted and threaded and the thread of the shaft is provided at the end of the shaft Leading a fastening device comprising a threaded body 5 which is formed to.

  The distance L2 from the through hole of the fixing auxiliary tool 1 of this invention should just exceed the distance L1 of the metal fitting 11 attached to the wall surface of a building, but if specified, L1 <L2 <L1 × 1.5 is an appropriate range. is there.

  When fixing the metal fitting 11 attached to the wall surface of a building using the fixing auxiliary tool 1 of the present invention, the fixing auxiliary tool 1 is placed on the metal fitting 11 attached to the wall surface of the building as shown in FIG. The screw hole 12 that penetrates and the through hole 2 are placed so as to overlap.

  Subsequently, the pointed tip of the screw body 5 is inserted into the through-hole 2 and the screw is rotated and inserted with a tool such as an electric screwdriver.

  Since the diameter of the through hole 2 is smaller than the thread diameter of the screw, when the operator rotates right while the screw is pressed against the fixing assisting tool 1, the fixing assisting tool 1 that receives the rotational force is the same as the screw body 5. Turn right.

  However, the protrusion 4 immediately hits the end of the metal fitting attached to the wall surface of the building, and the rotation of the fixing auxiliary tool 1 is prevented.

  Thereafter, only the screw body 5 continues to rotate and enters the through hole 2 of the fixing assisting tool 1 while forming a female screw.

  Eventually, the head of the screw body 5 hits the surface of the fixing auxiliary tool 1, and the screw thread of the screw body 5 is fitted into the through-hole 2 of the fixing auxiliary tool 1, and a strong rotational torque is generated in the fixing auxiliary tool 1. .

  If the fixing aid 1 of the present invention is not used and a known washer is used in which the through hole 2 is larger than the thread diameter and does not have the hanging protrusion 4, there is no function to stop this torque. In addition, the screw is allowed to have excessive rotational movement, and at this stage, the screw thread destroys a brittle material such as a wall of a building.

  When the fixing aid 1 of the present invention is used, the screw thread and the small through hole 2 of the fixing aid 1 have a relationship of “male screw” and “female screw”, which resists a strong rotational torque and has a screw body. Excessive rotation is prevented, the operator is informed that the tightening of the metal fitting 11 attached to the wall surface of the building has been sufficiently completed, and the screw tightening operation is completed.

  There are many known pointed screws that do not have a thread from just below the head. In the present invention, the rotational torque applied to the screw body 5 at the time of final tightening is the fixing aid 1. Therefore, it is essential that the screw thread is formed just below the head.

  In addition, known washers are known in which a locking piece 3 as disclosed in Patent Document 2 is provided. However, the idea and configuration of preventing excessive rotation by a screw thread and its cooperation. Does not exist.

  It is desirable that the protrusion 4 has a drooping dimension that is substantially the same as the thickness T1 of the metal fitting 11 attached to the wall surface of the building, and the end surface on the right rotation direction side is drooping vertically.

  When the protrusion 4 does not hang down with a sufficient length, it turns upward due to the elasticity of the fixing aid 1 when it starts to rotate clockwise and hits the end of the metal fitting 11 attached to the wall of the building. There is a risk of overturning the metal fitting 11 attached to the wall surface of the building and continuing the clockwise rotation. However, since it hits another end again, the rotation of the fixing assisting tool 1 is again prevented.

  On the other hand, when the sagging dimension is larger than the thickness T1 of the metal fitting 11 attached to the wall surface of the building, there is a risk of damaging the wall surface of the building. is not. Therefore, the lengths may be “approximately” the same length.

  As shown in FIG. 4, the sagging protrusion 4 has two end surfaces, an end surface 4a in the right rotation direction and an end surface 4b in the left rotation direction. It is desirable that the end surface 4a in the rotational direction is inclined from the flat portion of the fixing assisting tool 1 vertically or so that the lower end protrudes in the right rotational direction.

  As shown in FIG. 5, the dish-like depression 3 enters the screw hole 12 through which the metal fitting 11 is attached to the wall surface of the building by tightening the screw 5, and enters the fixing aid 1 and the wall surface of the building. This has the effect of correcting the positional deviation of the metal fitting 11 to be attached.

  However, the function of the dish-like depression 3 more important than that is a complete screw thread from the tip than the incomplete screw thread 5a which tends to occur about 1/2 pitch immediately below the screw head as shown in FIG. This makes it possible to obtain a stable fit between 5b and the through hole 2 and to make the restraining function effective, and this means that the diameter of the through hole 2 is smaller than the thread diameter. This is an essential component of the present invention.

  As shown in FIG. 6, the through hole 2 of the fixing auxiliary tool 1 is notched at one place on the inner peripheral surface of the through hole 2 in order to make it easy for screw threads to form a passage therethrough. 2a may be provided, and the recesses of the notch front wall 2b and the notch rear wall 2c may be made different so as to facilitate thread passage, but the fixing aid 1 is thin. When the thread can self-form the internal thread in the through hole 2, the notch 2a may be omitted.

  When the fixing aid 1 of the present invention is used for a material such as fragile concrete or a block already described, it extends from the middle part to the tip part of the body having a vertical cavity inside a rod body having a substantially circular cross section. An expansion plug generally called “plug” having a split groove is inserted into the tip of the screw 5 and used, but the illustration is omitted.

  Illustration of screw fixing aid   An example of metal fittings attached to the wall of a building   Fixing device usage diagram   Example of protrusion 4   Tightened state cross section   Example of notch in through hole

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixing tool 2 Through-hole 2a Notch 2b Notch front wall 2c Notch rear wall 3 Dish-shaped hollow part 4 Protrusion 4a End face 4b in right rotation direction End face 5 in left rotation direction Screw body 5a Incomplete thread 5b Complete thread 11 Metal fitting 12 attached to the wall of a building 12 Screw hole 13 for screw insertion Shortest end

Claims (1)

L1 is the distance from the center of the threaded hole for screw insertion provided in the metal fitting attached to the wall of the building and the shortest end, and T1 is the thickness of the metal fitting attached to the wall of the building. When the outer shape is made of a plate-like metal plate with an arbitrary circular or polygonal shape, a circular through hole smaller than the screw thread diameter of the screw is formed on the flat surface, and a dish-shaped depression is formed around the through hole. A screw provided with a protrusion that hangs down in the same direction as the dish-like depression at the same length as T1 in at least one place on the outer periphery of the metal plate at a distance L2 from the center of the through-hole exceeding L1 From the fixing auxiliary tool and the screw body formed until the sharp tip of the shaft portion is inserted into the through-hole and then screwed, and the screw thread of the shaft portion reaches just below the head provided at the end of the shaft portion. Fixing device that becomes.

Images