JP3763912B2 - Manufacturing method of expansion sleeve of fixing tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has an expansion sleeve having a head at the base end and a plurality of slots extending in the axial direction and having a female screw formed at the tip, and a male screw at the shaft and inserted into the expansion sleeve from the base end Further, the present invention relates to a method for manufacturing an expansion sleeve in a fixing tool which is composed of a combination with a shaft-like member screwed on a female screw and can fix a member to be fixed only by work from the front side.
[0002]
[Prior art]
Conventionally, a fixing tool that can be fixed only by the work from the front side without an operator entering the back side of the member or inserting tools is widely used.
[0003]
An expansion sleeve having a head at the base end and a plurality of slots extending in the axial direction and having a female thread formed at the tip, and a male thread at the shaft and fitted into the expansion sleeve and screwed into the female thread One of them is a fixing tool composed of a shaft-shaped member, and an expansion sleeve screwed with the shaft-shaped member is fitted into a prepared hole in the fixed member from the front side, and the head of the expansion sleeve is gripped with a tool. By rotating the shaft-shaped member in a fixed state and moving the female screw mounted on the male screw in the proximal direction, the expanding portion piece that is the portion between the slots is refracted and expanded, The member to be fixed is sandwiched and tightened in cooperation with. Such a fixing tool is widely known as described in, for example, Japanese Utility Model Publication No. 56-48965.
[0004]
And this kind of fixing tool has been widely used mainly for fixing a roof plate in the past, but in recent years, it has come to be used for the connection between a frame member of a unit type house and a panel. Yes.
[0005]
In such a fixing tool, the slot of the expansion sleeve needs to be formed so that the expansion portion piece is appropriately expanded. For this purpose, first, as shown in FIG. 4 (A), a tubular member 5 having a head 51 at the base end and a female screw 53 at the tip is manufactured. The expansion sleeve 50 is manufactured by simultaneously forming and forming a plurality of slots without causing deformation such as bending or twisting the tubular member 5 by simultaneously pressing and cutting a slot forming tool.
[0006]
At this time, the groove hole 54 is a round hole-shaped groove expanding portion at an appropriate place, for example, slightly closer to the base end than the center of the expanding portion piece 55 so that the expanding portion piece 55 can be appropriately refracted and expanded. By providing 56, a stress concentration portion 57 composed of a narrow width portion is often provided on the expanded portion piece 55.
[0007]
[Problems to be solved by the invention]
However, when such a slot 54 is formed by cutting a tool, as shown in FIG. 3, the expanded portion P is pushed out and swelled by the thickness of the tool 4. As shown in FIG. 4B, the diameter of the expanded portion 59 becomes larger than the tube base end portion 58 sandwiched between the expanded portion 59 and the head 51.
[0008]
On the other hand, since the pilot hole provided in the member to be secured must have a diameter that allows the expanded portion 59 to be inserted, when the expanded portion 59 has a larger diameter than the tube base end portion 58, as shown in FIG. 50 is fitted into the lower holes 15 and 16 of the fixed members 11 and 12 and the head 51 is overlapped with the fixed member 11 on the front side, the tube base end portion 58 has a gap so that the lower holes 15 and 16 have a gap. It will be in the state fitted in.
[0009]
If there is a gap as described above, the members 11 and 12 to be bonded to each other may be displaced by vibrations, particularly an earthquake, and an excessive force such as tension may be generated to create a crack. Cracks that occur in members, panels, etc., can cause a decrease in building strength or rain leaks.
[0010]
[Means for Solving the Problems]
Accordingly, the present invention has been made to solve the above-described problem, and is a method of manufacturing an expansion sleeve by forming a plurality of slots extending in the axial direction by pressing and cutting a plurality of slot forming tools into a tubular member. The tube base end portion sandwiched between the head portion of the tubular member and the base end of the slot forming portion is formed to have a large diameter in advance by at least the diameter that is increased by the formation of the slot.
[0011]
Thereby, in the expansion sleeve obtained by forming the slot in the tubular member, the tube base end portion fitted in the prepared hole of the member to be fixed has the same diameter as the expansion portion or a larger diameter than the expansion portion. Therefore, the expansion sleeve can be fitted into the lower hole without any gap, and fixing can be performed such that the member to be fixed does not shift.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0013]
First, the tubular member 2 having the head 21 at the proximal end and the female screw 23 at the distal end is manufactured. As shown in FIG. 1 (A), the tubular member 2 includes a tube base end portion 22 on the proximal end side of a portion that forms the groove hole in the tubular portion on the distal end side with respect to the head portion 21. A large diameter is formed by the amount that swells during formation. Such a tubular member 2 has a cylindrical body formed by drilling a round bar having a head formed by forging, or a screw formed on a tip of a cylindrical body formed by deep drawing a flat plate. Then, the base end portion of the tubular member 5 as shown in FIG. 4A made by the conventional manufacturing method of providing a female screw can be easily manufactured by expanding the diameter by swaging, for example. .
[0014]
Next, when the slot forming tool 24 is formed by simultaneously pressing and cutting the slot forming tool from a plurality of locations on the side surface of the portion to be the expanded portion, for example, four locations at equal intervals in the circumferential direction. The opening piece 25 is pushed outward and the diameter of the expanding portion 26 is increased. However, since the tube base end portion 22 is previously formed to have a larger diameter, the completed expansion sleeve 20 has a tube base end portion 22 and an expanded portion 26 as shown in FIG. Same diameter.
[0015]
Therefore, as shown in FIG. 2, when the expansion holes 20 are inserted with the lower holes 13 and 14 of the fixed members 11 and 12 having the same diameter as the tube base end portion 22, the tube base end portion 22 and the lower holes 13 and 14 are inserted. The 14 peripheral walls are in close contact with each other. Therefore, when the shaft-like member 3 screwed on the female screw 23 of the expansion sleeve 20 is turned to refract and widen the widened portion 25 and cooperate with the head 21 to sandwich and fix the members 11 and 12 to be fixed, Since the fixing members 11 and 12 are fixed without being shifted not only in the direction perpendicular to the surface but also in the direction parallel to the surface, excessive stress is not generated and a crack or the like does not occur.
[0016]
The tube base end portion 22 of the expansion sleeve 20 in which the slot 24 is formed has a slightly larger diameter than the expanded portion 26, and even if the expanded portion 26 is loosely inserted into the lower hole, the tube base end portion 22 is not By being fitted into the lower hole without a gap, the members to be fixed can be fixed without being displaced.
[0017]
【The invention's effect】
According to the present invention, even when a plurality of slot forming tools are pressed and cut at the time of slot formation, the diameter of the expanded portion of the expansion sleeve can be reduced by increasing the diameter of the tube base end by a predetermined size in advance. It will not be larger than the tube end.
[0018]
Therefore, it is possible to fit the base end of the pipe into the pilot hole provided in the fixed member without any gaps, and the fixed members do not shift due to an earthquake after fixing, and there is no cracking that causes a decrease in strength or rain leakage. Occurrence can be eliminated.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a use state of an expansion sleeve manufactured by the embodiment of FIG.
FIG. 3 is an explanatory cross-sectional view showing a state when a groove is formed.
FIG. 4 is a longitudinal sectional view showing a conventional example.
FIG. 5 is a longitudinal sectional view showing a usage state of an expansion sleeve manufactured by the conventional example of FIG. 3;
[Explanation of symbols]
2 Tubular member 20 Expansion sleeve 21 Head 22 Pipe base end 23 Female screw 24 Groove hole 25 Expanding part piece 26 Expanding part

Claims (1)

A tubular member having a head at the proximal end and an internal thread at the distal end is formed, and a plurality of slot forming tools are pressed into the tubular member to form a plurality of slots extending in the axial direction, thereby manufacturing an expansion sleeve. In the method, the diameter of the tube base end portion sandwiched between the head portion of the tubular member and the base end of the slot forming portion is formed in advance so as to increase the diameter by at least the formation of the slot. The manufacturing method of the expansion sleeve of the fixing tool characterized by the above-mentioned.

Images