TWI750992B - Expansion screw based fastening device - Google Patents

Abstract

An expansion screw based fastening device includes an expansion screw, an internally threaded member, and a sleeve. The expansion screw includes a head having a plurality of positioning protrusions on a bottom; and a threaded shank. The internally threaded member includes a nut, a constriction member formed with the nut, and an internally threaded hole through both the nut and the constriction member with the threaded shank threadedly passing through. The sleeve includes a fitting member and a moveable hollow member with the fitting member partially disposed therein, the moveable hollow member including a hole for receiving the nut. The fitting member includes positioning members on an outer surface and urging against an inner surface of the hole, and a through hole including a fastening member having threads, and a joining member.

Description

Combination structure of rotary tightening screw

The present invention relates to a tightening screw; more specifically, it particularly refers to a combination structure of a rotary tightening screw.

Generally, the tightening screw is used to first pass the bolt through the object to be fixed, then put the outer sleeve on the bolt, then pour the adhesive into the gap between the outer sleeve and the bolt, and finally use the oil pressure through the hydraulic press. The resulting force compresses the outer sleeve and causes the object to be fixed to be tightly clamped between the bolt and the outer sleeve.

However, the problems faced in the use of general tightening screws mainly include the following two points:

1. The hydraulic press used for construction is bulky and inconvenient to carry.

2. Although the tightening screws after completion of construction have sufficient horizontal tensile strength, they are relatively weak in shear stress, so there is still a risk of falling off in case of vertical vibration.

In view of this, the applicant in this case, based on his years of experience in research and development in related fields, conducted in-depth discussions on the aforementioned deficiencies, and actively sought solutions based on the aforementioned needs. invention.

The main purpose of the present invention is to provide a tightening screw that can be installed only by using a hand-held power tool.

The secondary purpose of the present invention is to provide a compression screw with both horizontal tensile strength and shear stress resistance.

In order to achieve the above-mentioned purpose, the combined structure of the rotary tightening screw of the present invention includes a screw, an outer sleeve and a locking sleeve.

The screw is composed of a screw head and a screw rod, and the bottom surface of the screw head is provided with a plurality of positioning teeth.

The outer sleeve is composed of a locking section, a tightening section connected with the locking section, and a screw hole penetrating the locking section and the tightening section, and the screw hole is screwed with the screw rod.

The locking sleeve includes a pressing piece and a movable set sleeved on the outer layer of the pressing piece, and the movable set is provided with a locking hole corresponding to the shape of the locking segment, and the pressing piece has a The through hole and the positioning element arranged on the outer surface of the pressing piece and fixing the position of the movable set are composed of a pressing section with pressing teeth and a pivoting section for connecting with the hand-held power tool , and the width of one end of the pressing section away from the pivot section is greater than the width of one end close to the pivot section.

1: Combination structure of rotary tightening screws

11: Screws

111: screw head

1111: Positioning teeth

112: Screw

12: Outer kit

121: Locking section

122: Crunch segment

1221: Arc

123: screw hole

13: Locking Sleeve

131: Pressing parts

1311: Perforation

13111: Pressing segment

131111: Tight teeth

13112: Pivot segment

1312: Positioning components

132: Activity Kit

1321: Lock hole

2: to be fixed

3: Handheld power tools

4: Dent

Fig. 1: Schematic diagram of the combined structure of the rotary tightening screw of the present invention; Fig. 2: Schematic diagram of the screw of the present invention; Figure 3: The schematic diagram of the outer kit of the present invention; Figure 4: The schematic cross-sectional view of the outer kit of the present invention; Figure 5: The schematic diagram of the locking sleeve of the present invention; : Schematic diagram of the locking arrangement of the screw and the outer part of the present invention; Figure 8: Schematic diagram of the locking arrangement of the outer kit of the present invention; Figure 9: Schematic diagram of the adjustment of the locking sleeve of the present invention; : a schematic diagram of the construction completion of the present invention.

In order to allow a more detailed understanding of the purpose, effect, features and structure of the present invention, preferred embodiments are given and described in conjunction with the drawings as follows.

First, please refer to FIG. 1 . FIG. 1 is a schematic diagram of the combined structure of the rotary tightening screw of the present invention.

The combination structure 1 of the rotary tightening screw of the present invention includes a screw 11 , an outer sleeve 12 and a locking sleeve 13 .

Please refer to FIG. 2 , which is a schematic diagram of the screw of the present invention.

The screw 11 is composed of a screw head 111 and a screw rod 112. The bottom surface of the screw head 111 is provided with a plurality of positioning teeth 1111 for embedding the object to be fixed 2 (as shown in FIG. 7), and the positioning teeth 1111 appear as follows. Pyramid-shaped, and its apex is attached to the bottom surface of the screw head 111 .

Please refer to FIG. 3 and FIG. 4 at the same time. FIG. 3 is a schematic diagram of the outer kit of the present invention, and FIG. 4 is a cross-sectional view of the outer kit of the present invention.

The outer sleeve 12 includes a locking section 121 , a tightening section 122 connected to the locking section 121 , and a screw hole 123 penetrating the locking section 121 and the tightening section 122 , and the screw hole 123 is connected to the screw 112 . When screwed together, the end of the constricting section 122 presents an inwardly retracted arc surface 1221 .

Please refer to FIG. 5 and FIG. 6 at the same time. FIG. 5 is a schematic view of the locking sleeve of the present invention, and FIG. 6 is a schematic cross-sectional view of the locking sleeve of the present invention.

The locking sleeve 13 includes a pressing member 131 and a movable sleeve 132 sleeved on the outer layer of the pressing member 131 , and the movable sleeve 132 is provided with a locking hole 1321 corresponding to the shape of the locking section 121 , and The pressing member 131 has a through hole 1311 and a positioning element 1312 disposed on the outer surface of the pressing member 131 and fixed at the position of the movable sleeve 132 , and the through hole 1311 is formed by a pressing section with pressing teeth 131111 13111 and a pivot section 13112 for connecting with the hand-held power tool 3 (as shown in FIG. 8 ).

The detailed description of the embodiments of the present invention and related drawings for reference are as follows: please refer to FIG. 7 and FIG. 8 at the same time. Schematic diagram of the lock.

Before using the present invention, a hole must be drilled on the object to be fixed 2, and then the screw 11 is inserted into the hole to make the positioning teeth 1111 touch the surface of the object to be fixed 2, and then the outer sleeve 12 is taken out and bolted to the screw 112. superior.

Next, take out the locking sleeve 13 and insert the hand-held power tool 3 into the pivoting section 13112, and clamp the locking section 121 through the movable set 132 to completely lock the outer set 12, and in the process of locking the outer set 12 , the positioning teeth 1111 will gradually be embedded in the object to be fixed 2 , and when the outer sleeve 12 is completely locked, the bottom surface of the screw head 111 will be in contact with the surface of the object to be fixed 2 and the positioning teeth 1111 will be completely embedded in the object to be fixed 2 .

Please refer to Fig. 9, Fig. 10 and Fig. 11 together with Fig. 4. Fig. 9 is a schematic diagram of the adjustment of the locking sleeve of the present invention, Fig. 10 is a schematic diagram of the pressing and tightening section of the present invention, and Fig. 11 is a schematic diagram of the construction completion of the present invention. .

Then, after the movable sleeve 132 is pulled back and the front end of the pressing member 131 is exposed, then the pressing member 131 is put on the tightening section 122 and the pressing member 131 is rotated by the hand-held power tool 3, so that the tightening section 122 is continuously affected. The pressing member 131 is squeezed to eliminate the tiny gap between the screw hole 123 and the screw rod 112 , and at the same time, the compression section 122 is plastically deformed to clamp the screw rod 112 without loosening.

Finally, when the hand-held power tool 3 can no longer rotate the pressing member 131 , it can be confirmed that the present invention has been installed, and then the pressing member 131 is reversed to be separated from the tightening section 122 . , the outer surface of the tightening section 122 will be left with a dent 4 produced by the pressing of the tightening teeth 131111 .

To sum up the above, the advantage of the combination structure 1 of the rotary tightening screw of the present invention is that the movable set 132 and the pressing member 131 are used in sequence to lock the outer set in stages, The present invention only needs to hold the power tool 3 to complete the installation, and the rotation method can also provide sufficient horizontal and vertical tensile force to prevent the present invention from loosening.

Therefore, the present invention has excellent progress and practicability among similar products. At the same time, after checking the technical data and documents about such structures at home and abroad, it is true that no identical or similar structures exist before the application in this case. Therefore, this case The patent requirements for "creativeness", "suitability for industrial utilization" and "progressiveness" should be met, and the application should be filed in accordance with the law.

However, the above are only preferred embodiments of the present invention, and other equivalent structural changes made by applying the description of the present invention and the scope of the patent application should be included in the scope of the patent application of the present invention.

1: Combination structure of rotary tightening screws

11: Screws

12: Outer kit

13: Locking Sleeve

Claims (3)

A combination structure of a rotary tightening screw includes a screw, an outer set and a locking sleeve; the screw is composed of a screw head and a screw rod, and the bottom surface of the screw head is provided with a plurality of positioning teeth; the outer set It is composed of a locking section, a tightening section connected with the locking section, and a screw hole penetrating the locking section and the tightening section, and the screw hole is screwed with the screw rod; the locking sleeve includes a pressing section. A tightening piece and a movable set sleeved on the outer layer of the urging piece, and the movable set is provided with a locking hole corresponding to the shape of the locking segment, and the urging piece has a perforation passing through it and is arranged on the urging piece The outer surface is a positioning element that fixes the position of the movable set, and the perforation is composed of a pressing section with pressing teeth and a pivoting section for connecting with the hand-held power tool, and the pressing section is far away from the pivoting section. The width of one end is greater than the width of one end close to the pivoting section. The combined structure of the rotary tightening screw according to claim 1, wherein the positioning teeth are pyramid-shaped in appearance, and their apexes are in contact with the bottom surface of the screw head. The combined structure of the rotary tightening screw according to claim 1, wherein the end of the tightening section is an inwardly contracted arc surface.

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