CN211501243U

CN211501243U - Fork-type reusable expansion screw

Info

Publication number: CN211501243U
Application number: CN201922503558.2U
Authority: CN
Inventors: 赵立荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-28
Filing date: 2019-12-28
Publication date: 2020-09-15
Anticipated expiration: 2029-12-28

Abstract

The utility model discloses a divide fork reuse expansion screw relates to an expansion screw field. The utility model provides a present inflation screw can not reuse's drawback. The inner end of the screw rod of the forked reusable expansion screw is provided with a second external thread movably connected with the conical head; the outer end of the conical head is provided with an internal thread which corresponds to the external thread at the inner end of the screw rod, the outer edge of the conical head is vertically provided with an anti-skid bulge, and the inner wall of each expansion pipe claw on the expansion sleeve is fixedly provided with a sliding plate. The utility model has simple structure, easy manufacture, convenient installation and recovery.

Description

Fork-type reusable expansion screw

Technical Field

The utility model relates to an expansion screw field especially relates to a fork formula reuse expansion screw.

Background

At present, expansion screws are generally used for fastening objects in buildings, so that the expansion screws have wide application range. The general expansion screw is composed of an expansion sleeve, a screw rod with a conical head, a screw cap and the like, wherein one end of the expansion sleeve is provided with an expansion groove, one end of the screw rod is provided with the conical head, when the expansion screw is installed, firstly, a hole is drilled in a wall, the screw rod and the expansion sleeve are placed in the hole, then, the screw cap is screwed to pull the screw rod, the conical head of the screw rod extrudes the expansion end of the expansion sleeve to expand, the expansion end is tightly expanded with the wall hole, and an installed object is fixed on the wall. However, the existing expansion screw is influenced by the structure, the expansion sleeve is difficult to take out the screw rod and the expansion sleeve from the wall hole after entering the wall hole and being extruded and expanded by the conical head, so that the expansion screw cannot be reused in reality, not only is waste caused, but also the attractiveness of the wall body is influenced when the expansion screw is left on the wall, and meanwhile, the screw rod is exposed out of the wall surface, so that the potential safety hazard is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the deficiencies in the prior art and providing a forked reusable expansion screw which has simple structure, easy manufacture, convenient installation and recovery.

In order to achieve the purpose, the utility model provides a bifurcate reusable expansion screw, which comprises a screw rod with a conical head, a screw cap and an expansion sleeve, wherein the outer end of the screw rod is provided with a first external thread, the screw cap is movably connected with the outer end of the screw rod through the first external thread, and the conical head is fixed at the inner end of the screw rod; the inner end of the expansion sleeve is provided with a plurality of expansion pipe claws; the inner end of the screw rod is provided with a second external thread movably connected with the conical head; the outer end of the conical head is provided with internal threads corresponding to the external threads at the inner end of the screw rod, the outer edge of the conical head is vertically provided with an anti-skid bump, and the anti-skid bump is positioned in a gap between two adjacent expansion pipe claws on the expansion sleeve; and a sliding plate is fixedly arranged on the inner wall of each expansion pipe claw on the expansion sleeve, and the axial cross section of the sliding plate in the expansion sleeve is in a right-angled triangle shape.

The expansion sleeve is provided with two semi-arc expansion pipe claws which are symmetrical in size and equal, a right-angle edge of a sliding plate in each expansion pipe claw is radially and vertically fixed on the inner wall of each expansion pipe claw, and the length of the right-angle edge of the sliding plate perpendicular to the inner wall of each expansion pipe claw is smaller than the inner diameter of the expansion sleeve.

The length of the antiskid projections is equal to the thickness of the pipe wall of the expansion sleeve; one or two extraction holes are arranged on the outer end of the expansion sleeve.

The utility model has the advantages that: the fork-type reusable expansion screw of the utility model has simple structure, easy manufacture and convenient installation; the utility model changes the prior screw and conical head integrated structure into a split movable connecting structure through threads, thereby realizing the beneficial effect of recycling the expansion screw, and solving the defect that the expansion screw can not be pulled out in the wall hole after being used; the expansion screw can be repeatedly used, so that the wall surface can be artificially restored to be beautiful; and because the wall surface has no metal projection, the potential safety hazard is fundamentally eliminated.

The following describes the fork-type reusable expansion screw with reference to the drawings.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is an exploded view of the present invention;

fig. 3 is a schematic view of the half-wall structure of the expansion casing of the present invention.

In the figure: 1. the expansion pipe comprises a screw, 2, a screw cap, 3, an expansion sleeve, 4, first external threads, 5, a conical head, 6, expansion pipe claws, 7, second external threads, 8, internal threads, 9, anti-skidding protrusions, 10, a sliding plate, 11 and a taking-out hole.

Detailed Description

As shown in fig. 1 and 2, the bifurcated reusable expansion screw of the present embodiment includes a screw rod 1 with a conical head, a nut 2 and an expansion sleeve 3, wherein an external thread one 4 is disposed at an outer end of the screw rod 1, the nut 2 is movably connected with the outer end of the screw rod 1 through the external thread one 4, and the conical head 5 is fixed at an inner end of the screw rod 1; the inner end of the expansion sleeve 3 is provided with a plurality of expansion pipe claws 6. The inner end of the screw rod 1 is provided with a second external thread 7 movably connected with the conical head 5; the outer end of the conical head 5 is provided with an internal thread 8 corresponding to the external thread 7 at the inner end of the screw rod 1, the outer edge of the conical head 5 is vertically provided with an anti-skid protrusion 9, and the anti-skid protrusion 9 is positioned in a gap between two adjacent expansion pipe claws 6 on the expansion sleeve 3. The inner wall of each expansion pipe claw 6 on the expansion sleeve 3 is fixedly provided with a sliding plate 10, and the axial cross section of the sliding plate 10 in the expansion sleeve 3 is in a right-angled triangle shape. The length of the antiskid projection 9 is less than or equal to the thickness of the pipe wall of the expansion casing 3; the outer end of the expansion shell 3 is provided with one or two withdrawal holes 11.

As shown in fig. 3, two expansion pipe claws 6 which are symmetrical and equal in size and are in a semi-arc shape are arranged on the expansion sleeve 3, a right-angle side of a sliding plate in each expansion pipe claw 6 is radially and vertically fixed on the inner wall of each expansion pipe claw 6, and the length of the right-angle side of the sliding plate 10 which is vertical to the inner wall of each expansion pipe claw 6 is smaller than the inner diameter of the expansion sleeve 3.

After the second external thread 7 of the screw rod 1 is connected with the internal thread 8 of the conical head 5, the first external thread 4 end of the screw rod 1 penetrates through the expansion sleeve 3, meanwhile, the anti-skid protrusions 9 slide along a gap between two adjacent expansion pipe claws 6 on the expansion sleeve 3, and the screw cap 2 is movably connected with the first external thread 4 of the screw rod 1 to form a finished product. The utility model discloses an expansion screw inserts the downthehole tight nut of screwing 2 of wall and drives screw rod 1 rotatory, screw rod 1's rotation then makes conical head 5 rotatory along two 7 external screw threads of screw rod 1, just make conical head 5 move along two 7 outside screw thread one 4 end directions in expansion sleeve 3 along screw rod 1's external screw thread this moment, just extrude slide 10 on the expansion pipe claw 6 inner wall along with conical head 5 to the motion of nut 2 end, so that expansion pipe claw 6 is strutted and extrudes the inner wall in wall hole, thereby realize expansion screw's the tight function of expanding.

If need take out the utility model discloses a during the expansion screw, earlier derotation loosen nut 2 promptly and make nut 2 and expansion sleeve 3 outer port's distance equal the conical head 5 originally in the expansion sleeve 3 removal after the distance, impel screw rod 1 to the wall downthehole with external force, the non-skid stud 9 of conical head 5 then gets back to the normal position along the gap on expansion sleeve 3 between two adjacent expansion pipe claws 6, reuse metal hook inserts the 11 power of getting on the expansion sleeve 3 and draws alright whole outward to the wall hole the utility model discloses an expansion screw takes out to realize recycle's purpose.

Claims

1. A forked reusable expansion screw comprises a screw rod with a conical head, a screw cap and an expansion sleeve, wherein an external thread I is arranged at the outer end of the screw rod, the screw cap is movably connected with the outer end of the screw rod through the external thread I, and the conical head is fixed at the inner end of the screw rod; the inner end of the expansion sleeve is provided with a plurality of expansion pipe claws; the inner end of the screw is provided with a second external thread movably connected with the conical head; the outer end of the conical head is provided with internal threads corresponding to the external threads at the inner end of the screw rod, the outer edge of the conical head is vertically provided with an anti-skid bump, and the anti-skid bump is positioned in a gap between two adjacent expansion pipe claws on the expansion sleeve; and a sliding plate is fixedly arranged on the inner wall of each expansion pipe claw on the expansion sleeve, and the axial cross section of the sliding plate in the expansion sleeve is in a right-angled triangle shape.

2. The bifurcate reusable expansion screw according to claim 1, wherein the expansion sleeve is provided with two half-arc expansion pipe claws which are symmetrical and equal in size, a right-angle side of the sliding plate in each expansion pipe claw is radially and vertically fixed on the inner wall of each expansion pipe claw, and the length of the right-angle side of the sliding plate vertical to the inner wall of each expansion pipe claw is smaller than the inner diameter of each expansion sleeve.

3. The bifurcated reusable expansion screw of claim 2, wherein the length of the non-slip projections is less than or equal to the wall thickness of the expansion sleeve; one or two extraction holes are arranged on the outer end of the expansion sleeve.