TWM501493U - Expansion screw - Google Patents

Description

Expansion screw

The present invention relates to an expansion screw, and more particularly to an expansion screw that can fix an object to a load-bearing structure.

Referring to FIG. 1 , a conventional expansion screw 9 is disclosed. The expansion screw 9 includes a screw 91 , an expansion sleeve 92 and a pressing member 93 . The screw 91 is sleeved for the expansion sleeve 92; the outer peripheral wall of the expansion sleeve 92 is provided with a plurality of grooves 921, and an expansion piece 922 is formed between the plurality of grooves 921; The outer peripheral wall of the pressing member 93 is provided with two planar inlay portions 931, so that the outer peripheral contour of the pressing member 93 is non-circular in a radial cross section. The two-plane embedding portion 931 is configured to be embedded in the inner peripheral wall of each of the expansion sheets 922 of the expansion sleeve 92.

When the expansion screw 9 is actually used, various items such as a wall panel or a shelf can be fixed to a load-bearing structure (such as a wall or a floor, etc.) by the expansion screw 9. During the installation, the expansion screw 9 can be inserted into one of the bores of the load-bearing structure, and then the screw 91 is rotated by an external force, and the screwing relationship between the screw 91 and the pressing member 93, and The design of the expansion piece 922 of the expansion sleeve 92 is matched with the design of the expansion piece 922 of the expansion sleeve 92, and the tension member 93 can be forced to linearly under the condition that the pressing member 93 cannot be rotated. The movement is performed to push the expansion sheets 922 to form a radial expansion, so that the plurality of expansion sheets 922 can abut against the bore of the load-bearing structure to complete the installation work of the expansion screws 9.

During the installation of the above-mentioned expansion screw 9, when the screw 91 is rotated to force the When the pressing member 93 moves and pushes against the plurality of inflatable sheets 922 to form a radial expansion, the positioning of each of the expansion sheets 922 of the expansion sleeve 92 can be utilized by the two planar caulking portions 931 of the pressing member 93. Acting to prevent the pressing member 93 from forming an idle motion inside the expansion sleeve 92 as the screw 91 rotates. However, as shown in FIG. 2, as the plurality of expansion sheets 922 gradually form a radial expansion, the two planar caulking portions 931 of the pressing members 93 will be less likely to be embedded in the respective expansion sheets of the expansion sleeve 92. The inner peripheral wall of the 922 even causes the two-plane embedding portion 931 to form a non-stressed portion. Therefore, the pressing member 93 may still rotate with the screw 91 to form an idling condition inside the expansion sleeve 92, thereby causing a idling condition. The plurality of expansion sheets 922 eventually fail to form a maximized radial expansion state, so that the plurality of expansion sheets 922 cannot be surely abutted against the bore of the load-bearing structure, so that the conventional expansion screw 9 has poor installation convenience. And many problems such as poor fixing effect have yet to be resolved.

The creation system provides an expansion screw to ensure that the pressing member has a better force receiving portion during the installation process to effectively prevent the occurrence of idling conditions.

The expansion screw of the present invention comprises a rod body, an expansion sleeve and a pressing member. One end of the rod body is provided with a rotating portion, and the other end is provided with a screwing portion. A pushing member is disposed between the rotating portion and the threaded portion, and the pushing member has a topping portion facing the threaded portion. The expansion sleeve is sleeved on the rod body, one end of the expansion sleeve is provided with an abutting end facing the abutting end of the pushing member, and the other end is provided with an expansion portion, and the expansion portion is provided with a plurality of grooves Forming an expansion piece between the plurality of grooves; the pressing member is screwed to the screwing portion of the rod body, and the outer peripheral wall of the pressing member is provided with at least one positioning protrusion, the at least one positioning protrusion The cartridge is at least one of the grooves of the expansion sleeve.

The expansion screw of the present invention, wherein a cushioning member is disposed between the abutting end of the pushing member and the abutting end of the expanding sleeve.

The expansion screw of the present invention, wherein the abutting end of the expansion sleeve forms a plurality of missing slots, and the buffering member is provided with a plurality of limiting blocks, and the plurality of limiting blocks are engaged in the plurality of missing slots.

The expansion screw of the present invention, wherein the pushing member is integrally formed on the rod body.

The expansion screw of the present invention, wherein the pushing member is a hollow sleeve which forms an opening at opposite ends, the hollow sleeve is sleeved on the rod body, and a pad is arranged between the hollow sleeve and the rotating portion sheet.

The expansion screw of the present invention, wherein the pressing member has a first end and a second end, and the pressing member is provided with a screw hole extending from the first end to the second end, the pressing member The screw hole is screwed to the screw portion of the rod body.

The expansion screw of the present invention, wherein the outer diameter of the pressing member gradually decreases from the first end toward the second end.

The expansion screw of the present invention, wherein the positioning protrusion of the pressing member has a radial sectional shape of a rectangle or a trapezoid.

The locating expansion screw of the present invention can be locked to the groove of the expansion sleeve by the positioning protrusion of the pressing member, so as to effectively prevent the pressing member from forming an idling state inside the expansion sleeve 2 as the rod rotates. It is ensured that each of the expansion sheets of the expansion sleeve can form a radially expanded state, so as to improve the assembly convenience and increase the fixing effect.

[this creation]

1‧‧‧ rod body

11‧‧‧Rotating Department

12‧‧‧ screw joint

13‧‧‧Parts

131‧‧‧Top

132‧‧‧shims

2‧‧‧Expansion sleeve

21‧‧‧Abutment

211‧‧‧ Missing slot

22‧‧‧Expansion

221‧‧‧ trench

222‧‧‧Expansion tablets

3‧‧‧forced parts

3a‧‧‧ first end

3b‧‧‧ second end

31‧‧‧Positioning bumps

32‧‧‧ screw holes

4‧‧‧ cushioning parts

41‧‧‧Limited blocks

W‧‧‧ load-bearing structure

W1‧‧‧ drilling

[study]

9‧‧‧Expansion screws

91‧‧‧ screw

92‧‧‧Expansion sleeve

921‧‧‧ trench

922‧‧‧Expanded tablets

93‧‧‧forced parts

931‧‧‧Face inlay

Fig. 1 is an exploded perspective view of a conventional expansion screw.

Fig. 2 is a reference diagram of the state of use of the conventional expansion screw.

Fig. 3: An exploded view of the expansion screw of the present invention.

Fig. 4 is a sectional view showing the combination of the expansion screws of the present invention.

Figure 5: A cross-sectional view of the expansion screw of the present invention.

Fig. 6 is a reference diagram of the state of use of the expansion screw of the present invention.

Figure 7 is an exploded perspective view of another embodiment of the present expansion screw.

Figure 8 is a cross-sectional view showing another embodiment of the present expansion screw.

Figure 9 is a cross-sectional view showing another embodiment of the present expansion screw.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is shown that the present expansion screw system comprises a rod body 1, an expansion sleeve 2 and a pressing member 3. The rod body 1 is sleeved for the expansion sleeve 2, and the pressing member 3 is screwed to one end of the screw 1.

One end of the rod body 1 is provided with a rotating portion 11 and the other end is provided with a screwing portion 12. The rotating portion 11 can be a structural design that can be fixed by a tool such as a wrench to rotate the rod 1. The present embodiment discloses that the rotating portion 11 has a polygonal shape; the screwing portion 12 can be used for the rod The outer peripheral wall of one end of the body 1 is formed with an external thread. Moreover, a pushing member 13 is disposed between the rotating portion 11 and the screwing portion 12, and the pushing member 13 has a top abutting end 131 facing the screwing portion 12, and the pushing member 13 can be integrally formed. On the rod body 1 (that is, directly formed on the outer peripheral wall of the rod body 1), the pushing member 13 can also be a member that can be disassembled on the rod body 1; in this embodiment, the pushing The abutting member 13 is a hollow sleeve which is formed with an opening at the opposite ends. The hollow sleeve is movably sleeved on the rod body 1 , and a gasket 132 is disposed between the hollow sleeve and the rotating portion 11 . The spacer 132 can increase the contact area between the pushing member 13 and the rotating portion 11, so that the pushing member 13 can be more firmly coupled to the rod 1.

The expansion sleeve 2 can be sleeved on the rod body 1. One end of the expansion sleeve 2 is provided with an abutting end 21, and the other end is provided with an expansion portion 22; wherein the abutting end 21 can face the pushing member 13 The abutting end 131 can face the screwing portion 12 of the rod body 1. In addition, the expansion sleeve 2 may be provided with a plurality of grooves 221 on the outer peripheral wall of the expansion portion 22, and an expansion piece 222 is formed between the plurality of grooves 221, and the surface of the expansion piece 222 may be a rough surface (for example, The embossing portion or the like is provided; thereby, when the abutting end 21 of the expansion sleeve 2 is pushed against the abutting end 131 of the pushing member 13, the expanding piece 222 can be fitted with the pressing member 3 The abutting end 21 faces the expansion portion An expansion is formed in the direction of 22.

The pressing member 3 is configured to be screwed to the screwing portion 12 of the rod body 1 , and the outer peripheral wall of the pressing member 3 is provided with at least one positioning protrusion 31 , and the at least one positioning protrusion 31 can be clamped to the At least one of the grooves 221 of the expansion sleeve 2. In this embodiment, the pressing member 3 has a first end 3a and a second end 3b. The pressing member 3 is provided with a screw penetrating from the first end 3a to the second end 3b. The hole 32 is screwed to the screwing portion 12 of the rod body 1 by the screw hole 32. Preferably, the outer diameter of the pressing member 3 is from the first end 3a toward the first portion The direction of the two ends 3b can be gradually decreased, so that the pressing member 3 is slightly tapered, whereby the second end 3b of the pressing member 3 can be more easily introduced into the expansion of the expansion sleeve 2. The inner peripheral wall of the piece 222 is fitted to the pusher 13 to force the expanded portion 22 to expand. Further, when it is defined that the direction of the pressing member 3 from the first end 3a toward the second end 3b is an axial direction, please refer to FIG. 5, the direction of the pressing member 3 perpendicular to the axial direction. Upward, the radial cross-sectional shape of the positioning protrusion 31 may be a rectangle. The radial cross-sectional shape of the present positioning positioning block 31 is not limited, and may be trapezoidal or other various polygonal shapes.

Please refer to Fig. 6. When the expansion screw of the present invention is used, various objects such as a wall plate or a rack (not shown) can be fixed to a load-bearing structure W (such as a wall or by using the expansion screw). Floor, etc.). During the installation, the expansion screw can be inserted into one of the holes W1 of the load-bearing structure W, so that the expansion sleeve 2 and the pressing member 3 are located in the hole W1, and the rod is matched by a tool. a rotating portion 11 for directly rotating the screw body 1; at this time, by the screwing relationship between the screwing portion 12 of the rod body 1 and the pressing member 3, the pressing member is further engaged The positioning projection 31 of the third embodiment is designed to be engaged with the groove 221 of the expansion sleeve 2, and can forcibly expand the pressing member 3 toward the expansion sleeve 2 under the condition that the pressing member 3 is prevented from rotating. The direction of the piece 222 is linearly moved, and the abutting end 131 of the pushing member 13 is pushed against the abutting end 21 of the expanding sleeve 2, so that the plurality of expanding pieces 222 can form a radial expansion, so that the plurality of expansions The sheet 222 can be abutted against the inner peripheral wall of the bore W1 of the load-bearing structure W to complete the installation of the expansion screw. industry. Moreover, when the rod body 1 is rotated in the opposite direction, the groove 221 of the expansion sleeve 2 can also guide the positioning protrusion 31 of the pressing member 3, so that the pressing member 3 can be detached from the expansion sleeve 2 The expansion portion 22, and the plurality of expansion sheets 222 can be restored to the original state. Therefore, the present expansion screw has the advantages of being reusable.

Further, as shown in FIGS. 7 and 8, a cushioning member 4 is preferably disposed between the abutting end 131 of the pushing member 13 and the abutting end 21 of the expansion sleeve 2. The cushioning member 4 can be, for example, The material is made of plastic or rubber, so that the abutting end 131 of the pushing member 13 is pushed into the abutting end 21 of the expansion sleeve 2, and the buffering member 4 can be used to form a buffering effect to avoid metal material. The abutting end 21 of the expansion sleeve 2 and the abutting end 131 of the pushing member 13 are damaged by direct contact; wherein the abutting end 21 of the expansion sleeve 2 can form a plurality of notches 211, the buffer The piece 4 is provided with a plurality of limiting blocks 41 that can be snapped into the plurality of notches 211 to provide better positioning. Further, as shown in FIG. 9, in the present embodiment, the radial shape of the positioning projection 31 may be trapezoidal.

In summary, the design of the expansion screw of the tensioning member 3 is applied to the groove 221 of the expansion sleeve 2 to effectively prevent the pressing member 3 from following the rod body 1 . Rotating to form an idling state inside the expansion sleeve 2, ensuring that each of the expansion sheets 222 of the expansion sleeve 2 can be radially expanded, so that the plurality of expansion sheets 222 are more reliably abutted against the load-bearing structure W The hole W1 is drilled to improve the assembly convenience and increase the fixing effect.

Although the present invention has been disclosed by the above-described preferred embodiments, it is not intended to limit the present invention, and it is still within the spirit and scope of the present invention to make various changes and modifications to the above embodiments. The technical scope of the protection is created, so the scope of protection of this creation is subject to the definition of the patent application scope attached.

1‧‧‧ rod body

11‧‧‧Rotating Department

12‧‧‧ screw joint

13‧‧‧Parts

131‧‧‧Top

132‧‧‧shims

2‧‧‧Expansion sleeve

21‧‧‧Abutment

22‧‧‧Expansion

221‧‧‧ trench

222‧‧‧Expansion tablets

3‧‧‧forced parts

3a‧‧‧ first end

3b‧‧‧ second end

31‧‧‧Positioning bumps

32‧‧‧ screw holes

Claims (8)

The utility model relates to an expansion screw, which comprises: a rod body, one end of the rod body is provided with a rotating portion, and the other end is provided with a screwing portion, and a pushing member is arranged between the rotating portion and the screwing portion, the pushing The piece has a top end facing the screwing portion; an expansion sleeve, the expansion sleeve is sleeved on the rod body, and one end of the expansion sleeve is provided with an abutting end facing the abutting end of the pushing member The other end is provided with an expansion portion, the expansion portion is provided with a plurality of grooves, and an expansion piece is formed between the plurality of grooves; and a pressing member is screwed to the screw portion of the rod body. The outer peripheral wall of the pressing member is provided with at least one positioning protrusion, and the at least one positioning protrusion is engaged with at least one groove of the expansion sleeve. The expansion screw of claim 1, wherein a cushioning member is disposed between the abutting end of the pushing member and the abutting end of the expanding sleeve. The expansion screw of claim 2, wherein the abutting end of the expansion sleeve forms a plurality of missing slots, and the buffering member is provided with a plurality of limiting blocks, and the plurality of limiting blocks are engaged in the plurality of limiting blocks. Missing slot. The expansion screw of claim 1, 2 or 3, wherein the pushing member is integrally formed on the rod. The expansion screw of claim 1, wherein the pushing member is a hollow sleeve that forms an opening at opposite ends, the hollow sleeve is sleeved on the rod body, and the hollow sleeve is A gasket is disposed between the cylinder and the rotating portion. The expansion screw of claim 1, wherein the pressing member has a first end and a second end, and the pressing member is provided from the first end to the a screw hole of the second end, the pressing member is screwed to the screw portion of the rod body by the screw hole. The expansion screw of claim 6, wherein the outer diameter of the pressing member gradually decreases from the first end toward the second end. The expansion screw of claim 1, wherein the positioning protrusion of the pressing member has a radial cross-sectional shape of a rectangle or a trapezoid.