JP4199909B2 - Screw fastener - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screw fixing tool used for attaching an instrument or equipment to a building such as concrete or mortar by using a screw and a combination of the fixing tool and the screw.
[0002]
[Prior art]
Conventionally, a method of attaching an instrument or equipment to a building such as concrete or mortar by using a screw is to drill a pilot hole in the concrete or mortar, and then insert a cylindrical plug into the concrete hole or mortar. A screw is inserted into a tool or equipment stacked on top of each other, and this screw is screwed into a plug in the pilot hole so that the screw expands the plug and fastens the equipment or equipment to concrete or mortar.
[0003]
[Problems to be solved by the invention]
By the way, the conventional plug as described above tries to obtain a fastening force by uniformly expanding the screw by screwing it in and crimping it to the inner peripheral surface of the pilot hole, thereby eliminating the space between the screw and the pilot hole. However, because the structure prevents the sliding of the plug and the concrete or mortar by friction between the outer surface of the expanded plug and the inner wall of the concrete or mortar, There is a problem that slipping easily occurs with respect to mortar.
[0004]
Accordingly, an object of the present invention is to screw the screw into the plug inserted into the lower hole, so that the plug is deformed and moved unevenly, and the screw thread directly bites into both the lower hole and the plug, making the material brittle. To provide a screw fixing tool that can secure a sufficient amount of screw thread penetration against concrete and mortar that is fragile and that can enhance the fastening force by a plug, and a combination of this fixing tool and screw. is there.
[0005]
[Means for Solving the Problems]
In order to solve the problems as described above, the present invention is partially adapted so that a plug inserted into a pilot hole provided for screwing a screw is parallel to a rod body made of two flexible materials. Connect the two heads to one end of each rod, and provide two heads larger than the cross-sectional shape of the rods. The thread of the screw screwed between the rod body from the guide hole to the lower hole into which the plug is inserted is formed on both the lower hole and the rod body. A configuration is adopted in which the maximum cross-sectional width of the plug is set to be smaller than the thread diameter of the screw to be used so as to directly bite into each.
[0007]
Here, by fitting the tip of the screw into the guide hole of the plug, a combined body in which the screw fixing tool and the screw are set in a connected state can be obtained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
1 and 2 show a basic structure of a screw fixing tool 1 according to the present invention. In the screw fixing tool 1, two rod bodies 2 and 2 made of a flexible material such as synthetic resin are parallel to each other. In this way, it is formed in the partially connected plug 1a, and is set smaller than the thread diameter D2 of the screw 3 such as a tapping screw or wood screw used in combination with the maximum cross-sectional width D1 of the plug 1a.
[0010]
The plug 1a in the example shown in FIG. 1A has two rod bodies 2, 2 having a circular cross section, and the two rod bodies 2, 2 are parallel to each other at the tip connection portion 4. It is formed by joining.
[0011]
The plug 1a in the example shown in FIG. 1 (b) has two rod bodies 2 and 2 having a circular cross section, and a plurality of intermediate portions of both rod bodies 2 and 2 are coupled to each other by thin linear connecting portions 5. The two rods 1 and 1 are made parallel to each other. In any example, the axial lengths of the two rods 2 and 2 may be set in accordance with the length of the screw 3 used in combination.
[0012]
A screw fixing tool 1 according to the present invention shown in FIG. 3 includes two rod bodies 2 and 2 made of a flexible material such as plastic, with a tip connecting portion 4 and a thin linear connecting portion 5 in the middle. The rods 2 and 2 are coupled to each other so that the two rods 2 and 2 are parallel to each other. On the upper end side of both the rods 2 and 2, a shaft-like portion 6 larger than the cross-sectional shape of the rods 2 and 2, A head portion 7 larger than the cross-sectional shape of the shaft-like portion 6 is provided at the end of the shaft-like portion 6 to form a plug 1a, and the shaft-like portion 6 is formed from the heads 7 provided on the rods 2 and 2 above. The guide hole 8 of the tip part of the screw 3 to be used in combination is provided at a position on the side facing each other.
[0013]
In the case shown in FIG. 4 (b), the two rod bodies 2, 2 have a cross-sectional shape with an outer arcuate surface and an inner inclined surface, and are connected to the upper ends of the rod bodies 2, 2. The shaft-shaped portion 6 and the head portion 7 at the upper end thereof have a semicircular cross section, and the guide holes 8 are provided at positions on the opposite sides of the shaft-shaped portion 6 from the head portions 7 of the rods 2 and 2. 4 is arranged coaxially with the center between the two rods 2, 2, and the tip portion of the screw 3 used in combination is fitted or screwed into the guide hole 8, as shown in FIG. A combined body in which the plug 1a and the screw 3 are set in a coaxial connection state can be formed.
[0014]
In the screw fixing device 1 of the present invention, the outer diameter D3 of the shaft-like portion 6 is set to be equal to or smaller than the screw thread diameter D2 of the screw 3, and the outer diameter D4 of the head portion 7 is the outer diameter of the shaft-like portion 6. The cross-sectional maximum width D1 of the plug 1a is set to be smaller than the screw thread diameter D2 of the screw 1a.
[0015]
5 (a) to 5 (i) show examples of different cross-sectional shapes adopted for the two rod bodies 2 and 2 in the screw fixing device 1 of the present invention , and are circular, square, polygonal, semi-circular. Arbitrary cross-sectional shapes, such as a circle and a triangle, can be adopted, (a) to (e) show examples of combinations of cross-sectional shapes equal to the rods 2 and 2, and (f) to (i) denote rods 2 and 2. Examples of combinations of different cross-sectional shapes and sizes of the same shape are shown.
[0016]
Threaded fastener of the present invention has a configuration as described above, will now be described fastening method had use of the screw fastener 1.
[0017]
As shown in FIG. 6 (a), a fixed object B such as equipment or equipment is stacked on the surface of a building A such as concrete or mortar or a block, and the building A or the building A or the like. Depending on the properties of the block or the like, a drill 11 is used to drill a pilot hole C having an inner diameter that is substantially the same as or slightly smaller than the screw thread diameter of the screw and a depth corresponding to the length of the screw. 6B, the rods 2 and 2 of the screw fixing tool 1 are inserted into the prepared hole C.
[0018]
In this state, the screw 3 is screwed in between the two rod bodies 2 and 2 from the guide hole 8 of the screw fixing tool 1. When the screw 3 that has been screwed in passes between the shaft 6 from the head 7 and enters between the rods 2 and 2, the rods 2 and 2 are set so that the maximum cross-sectional width D1 is smaller than the thread diameter of the screw 3. Therefore, the screw 3 is allowed to enter between the rods 2 and 2, and the rods 2 and 2 are pushed in one of the rotation directions of the screw 3. As a result, as shown in FIG. The screw 3 is arranged eccentrically with respect to the hole C, so that the thread 3a of the screw 3 enters while cutting the thread over both the concrete and the mortar surface and the rods 2 and 2, and the head of the screw 3 Fastening is completed by fastening the fixed object B in 3b.
[0020]
When the screw 3 is fastened, the screw fixing tool 1 is formed of a flexible synthetic resin, so that high heat is generated when the screw 3 is rotated between the rods 2 and 2 and the rod 2 is heated by this heat. 2 is released and bonded to the screw 3 to increase the effect of preventing the screw 3 from loosening, and the screw fixing tool 1 made of synthetic resin can absorb fine vibrations.
[0021]
In addition, the synthetic resin rods 2 and 2 serve as protective packings, can absorb over-torque after screwing and can prevent the threads formed on the rods 2 and 2 from being broken. Since the rods 2 and 2 deformed by compression are pressed against the concrete or mortar surface, the screw 3 can be removed several times and the fastening strength is not lowered.
[0022]
In the screw fastener 1 of the present invention, in which is provided a shaft-like portion 6 and the head 7 to the upper end of the rod 2, 2 shaft-like part 6 is pushed open immediately after screwing the start of the screw 3 Due to the friction with the lower hole C, the screw fixing device 1 can be prevented from idling.
[0023]
Further, since the rod bodies 2 and 2 are connected by a destructible connecting portion, when the screw enters between the rod bodies 2 and 2, the connecting portion 5 makes the screw 3 against the axis of the lower hole C. The connecting portion 5 is terminated by the pressure caused by the screw 3 being screwed in, and the role is finished.
[0024]
Thus, when fixing the fixed object B such as equipment and equipment to the surface of the building A, the prepared hole B and the building A are simultaneously drilled with the pilot hole C in an overlapped state. Inserting the screw fixing tool 1 into the lower hole C eliminates the need for operations such as preparing the lower holes as in the case of separately preparing the lower holes in the building A and the fixed object B, and the fixed object is long. This is particularly advantageous in the case of a scale, and the work efficiency can be greatly improved.
[0025]
【The invention's effect】
As described above, according to the present invention, the two rods made of a flexible material are formed in a plug that is partially connected so as to be parallel, and the screw that is used in combination with the maximum cross-sectional width of the plug is used. Since the thread diameter is set smaller than the thread diameter, the rod body is pushed to one side of the screw rotation direction as the screw enters, and as a result, the screw is arranged eccentrically with respect to the shaft center of the pilot hole. The thread of the screw enters the concrete and the mortar surface and the rod body while cutting the thread, and a firm fastening without loosening is obtained, and the rod body serves as a protective packing, and after the screwed fastening, It absorbs torque and prevents the thread formed on the rod from breaking, and the deformed rod is pressed against the concrete or mortar surface, so it can be removed several times. Possible, there is no reduction in the fastening strength.
[0026]
In addition, a screw fixing tool having a shaft and a head at one end of the rod body opens and expands immediately after the screw starts to be screwed, and the screw fixing tool is idled by friction with the lower hole. Can be prevented.
[0027]
Furthermore, the screw fastener and screw combination can be used by inserting the screw fastener into the pilot hole as it is, and the fastening operation by screwing the screw can be performed efficiently.
[Brief description of the drawings]
1A is a front view of a first example showing a basic structure of a screw fixing device according to the present invention, FIG. 1B is a front view of the second example, and FIG. 2A is a screw; FIG. 3B is a cross-sectional view showing the relationship between the screw fixing tool and the diameter of the screw. FIG. 3A is a perspective view showing the screw fixing tool of the present invention, and FIG. 4A is a front view showing a combination of a screw fixing tool and a screw, FIG. 5B is an enlarged cross-sectional view of the rod body, and FIGS. 5A to 5I are each a rod in the screw fixing tool. Cross-sectional views showing examples of different body cross-sectional shapes [FIG. 6] (a) and (b) are explanatory views sequentially showing the fastening process of an object to be fixed using a screw fixing tool. [FIG. ) Is an enlarged longitudinal sectional view showing a fastening state of an object to be fastened by a screw fixing tool, and (b) is a cross-sectional plan view thereof.
DESCRIPTION OF SYMBOLS 1 Screw fixing tool 1a Plug 2 Rod 3 Screw 4 Tip connection part 5 Connection part 6 Shaft part 7 Head part 8 Guide hole

Claims (1)

Plug to be inserted into the lower hole provided for screwing the screw, connected partially in parallel and can have rod with a flexible material of the two, to one end of both rods, the rods Provide heads that are larger than the cross-sectional shape, and provide guide holes at the tips of the screws to be used in combination on the opposite sides of both heads so that they are coaxial with the center between the two rods. The maximum cross-sectional width of this plug is combined so that the thread of the screw screwed between the rod body from the guide hole directly bites into both the lower hole and the rod body with respect to the prepared hole where the plug is inserted Screw fixing tool set smaller than the thread diameter of the screw used.

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