TWM465482U - Inner threaded self-tapping bolt - Google Patents

Description

Internal tooth self-tapping anchor

The present invention relates to a bolt, and more particularly to an internal self-tapping anchor.

As shown in FIG. 1 and 2, a conventional expansion screw 1 mainly includes an outer tip shell 11 and an inner tip 12, and the outer tip shell 11 is a hollow circular tube body having a through hole 111. The lower part of the shell 11 is provided with an internal thread 112. The outer end of the outer tip shell 11 is provided with a receiving portion 113 and at least one gap 114 is equidistantly arranged on the outer edge. The inner tip 12 is a tapered short cylindrical rigid body member.

In use, usually, a plurality of expansion screws 1 are driven into an RC wall 2 to prepare for hanging a fixture 31 (such as an air conditioning duct, a wire trough, etc.), and each expansion screw 1 is fixed. The inner tip 12 is first placed on the receiving portion 113 of the outer tip shell 11, and the outer tip shell 11 and the inner tip 12 are driven together by a gunpowder (not shown) or a hammer (not shown). In the hole 21 provided in the RC wall 2, the inner tip 12 is restricted by the inner side wall surface of the hole 21 of the RC wall 2, and one end of the outer tip shell 11 provided with the gap 114 is opened and abuts against the RC wall 2 The hole wall of the hole 21. After screwing one end of the plurality of screws 32 to the internal threads 112 of the outer tip shells 11, respectively, A support frame 33 is disposed at each of the equal positions of the screw 32, and a plurality of nuts 34 are screwed into the locking position, so that the to-be-fixed member 31 can be placed on the support frames 33.

However, in actual use, it is found that since the surface of the inner tip 12 is smooth, only the outer wall surface of one end of the expansion is pressed against the hole wall of the hole 21 of the RC wall 2, and it is easy to be in the fixing member 31, the support frame 33 and If the weight of the screw 32 is excessively applied, the slippage occurs, and even the fixture 31, the support frame 33 or the screws 32 are dropped. If the expansion screw 1 is used in a public place, it is more harmful to the public. The key to safety.

Therefore, the purpose of the present invention is to provide an internal self-tapping anchor that is easy to assemble and has a good load effect.

Therefore, the novel internal self-tapping anchor includes a screw head and a screw portion connected to the screw head. The screw head has an axially extending threaded groove. The screw portion has a shaft and a screw threaded around the rod body, the shaft has a diameter of 5.95 to 6.2 mm, the thread has an outer diameter of 8 to 8.22 mm, and the thread pitch of the screw It is 6.25 to 6.45 mm.

The utility model has the effect that the internal self-tapping anchor can be easily screwed into a preset positioning hole of a wall of a building, and in use, when most internal self-tapping anchors are respectively positioned, With a plurality of screws, one end is screwed with the thread groove of the internal self-tapping anchor bolts, and then a carrier is suspended for carrying the wire rack, the air conditioning duct waiting for the positioning object, so that not only the overall structural strength Good, and these internal self-tapping anchors are not easy to break away. The wall of the building and provides a good load effect.

4‧‧‧ internal tooth self-tapping anchor

41‧‧‧ screw head

411‧‧‧Thread groove

42‧‧‧ screw department

421‧‧‧ shaft

422‧‧‧ threaded teeth

43‧‧‧Hua Department

431‧‧‧ first surface

432‧‧‧ second surface

433‧‧‧Anti-loose teeth

51‧‧‧ wall

511‧‧‧Positioning holes

61‧‧‧ screw

62‧‧‧Carriage

63‧‧‧ nuts

64‧‧‧Objects to be located

D‧‧‧diameter

D‧‧‧OD

P‧‧‧ tooth distance

Θ‧‧‧ angle

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a perspective view showing a conventional expansion screw; FIG. 2 is a combined sectional view, which assists in explaining FIG. FIG. 3 is a perspective view showing a preferred embodiment of the self-propelled self-tapping anchor of the present invention; FIG. 4 is a side view, and FIG. 3 is a supplementary view; FIG. 4; and FIG. 6 is a schematic view showing the use of the preferred embodiment.

Referring to Figures 3, 4 and 5, a preferred embodiment of the self-propelled self-tapping anchor 4 of the present invention comprises a screw head 41 and a screw portion 42 coupled to the screw head 41. The screw head 41 has a threaded groove 411 extending in the axial direction. The screw portion 42 has a shaft 421 and a thread 422 spirally wound around the shaft 421. The shaft 421 has a diameter d of 5.95 to 6.2 mm. The outer diameter D of the thread 422 is 8 to 8.22 mm, and the pitch P of the thread 422 is 6.25 to 6.45 mm. The thread 422 has an upper edge surface 423 and a lower edge surface 424, and the upper edge The angle θ between the face 423 and the lower edge face 424 is 45 degrees. In addition, the internal self-tapping anchor 4 can further include a grading portion 43 having a first surface 431 connected to the screw head 41 and a first surface 431 opposite thereto. a second surface 432 having a plurality of anti-loosening teeth 433, the anti-loosening teeth 433 It is arranged in a continuous loop.

Referring to Figures 4 and 6, the internal self-tapping anchor 4 can be used for hanging objects in use. In detail, most of the internal self-tapping anchors 4 are screwed to a wall 51 of a building. In the plurality of preset positioning holes 511, one end of the plurality of screws 61 is screwed with the thread grooves 411 of the internal self-tapping anchors 4, and the other end of the screws 61 is simultaneously provided with a carrier 62. By means of a plurality of nuts 63 under the carrier 62 and respectively screwed on the other end of the screws 61, the carrier 62 is suspended, so that it can be waited for as a wire tray, an air conditioning duct The positioning object 64 is placed on the carrier 62.

Since the internal self-tapping anchors 4 are screwed to the positioning holes 511 of the wall 51 by the thread 422, the diameter d of the shaft 421 is 5.95 to 6.2 mm, and the outer diameter of the thread 422 is D is 8 to 8.22 mm, the pitch P of the thread 422 is 6.25 to 6.45 mm, and the angle θ between the upper edge surface 423 of the thread 422 and the lower edge surface 424 is 45 degrees, etc., so that each The inner screw type self-tapping anchor 4 and the positioning holes 511 of the wall 51 are more tightly and stably engaged, and the end of the screw 61 is also matched with the thread groove 411 of the inner self-tapping anchor 4 Therefore, the overall structural strength is good, and the internal self-tapping anchors 4 are not easily separated from the wall 51, and the load effect is good, so that the carrier 62 can stably carry the object to be positioned 64.

In summary, the self-propelled self-tapping anchor 4 of the present invention can increase the bonding force with the wall 51 by the above-mentioned structural design, and can be integrated with the screw 61 and the carrier 62 in use. The combined structure is strong, not However, the internal self-tapping anchors 4 are not easily separated from the wall 51, and the load effect is good, so that the carrier 62 can stably carry the object to be positioned 64, so that the purpose of the present invention can be achieved.

However, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the present patent application and the contents of the patent specification, All remain within the scope of this new patent.

4‧‧‧ internal tooth self-tapping anchor

41‧‧‧ screw head

411‧‧‧Thread groove

42‧‧‧ screw department

421‧‧‧ shaft

422‧‧‧ threaded teeth

423‧‧‧Upper rim

424‧‧‧ lower margin

43‧‧‧Hua Department

431‧‧‧ first surface

432‧‧‧ second surface

433‧‧‧Anti-loose teeth

D‧‧‧diameter

D‧‧‧OD

P‧‧‧ tooth distance

Θ‧‧‧ angle

Claims (4)

An internal tooth self-tapping anchor comprises: a screw head having an axially extending thread groove; and a screw portion connected to the screw head, the screw portion having a shaft and a spiral The thread surrounding the rod has a diameter of 5.95 to 6.2 mm, the thread has an outer diameter of 8 to 8.22 mm, and the thread has a tooth pitch of 6.25 to 6.45 mm. The internal tooth self-tapping anchor according to claim 1, further comprising a Chinese portion having a first surface connected to the screw head and a first surface opposite to the first surface The second surface has a plurality of anti-loosening teeth. The internal tooth self-tapping anchor according to claim 2, wherein the anti-loosening teeth are continuously arranged in a ring shape. The internal tooth self-tapping anchor according to claim 3, wherein the thread has an upper edge surface and a lower edge surface, and an angle between the upper edge surface and the lower edge surface is 45 degrees.