Expansion screw for cement wall
An expansion screw and wall technology, applied in the direction of pins, connecting components, mechanical equipment, etc., can solve the problems of easy falling off and low stability of expansion screws, and achieve the effect of reasonable size matching and increasing overall strength.
Inactive Publication Date: 2016-10-12
华文进
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Problems solved by technology
[0003] Expansion screws generally have a thicker screw. When a family needs to fix a nail on the wall to hang objects, they often use smaller expansion screws. However, the expansion screws commonly used at present are not stable and easy to fall off.
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[0013] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0014] like figure 1 , figure 2 As shown, a kind of expansion screw 1 that is used for cement wall comprises a plastic sleeve 10, and the middle part of described plastic sleeve 10 is provided with 4 expansion strips 20, and the outer surface of expansion strip 20 is respectively provided with 4 teeth Tooth 21, one end of plastic sleeve 10 is provided with a connector 30, and connector 30 is provided with an annular flange 31, and connector 30 is hollow structure and the interior is connected with plastic sleeve 10, and connector 30 is provided with a screw rod 40 , the screw 40 can be screwed in along the thread of the connector 30 and the inn...
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The invention discloses an expansion screw for a cement wall. The expansion screw comprises a plastic casing pipe, the middle of the plastic casing pipe is provided with four expansion strips, the outer surface of each expansion strip is provide with four teeth, one end of the plastic casing pipe is provided with a connector, the connector is provided with an annular flange, the connector is of a hollow structure, and the interior of the connector is communicated with the plastic casing pipe; a threaded rod is arranged in the connector and can be screwed among the connector and a thread formed in the inner wall of the plastic casing pipe and strut the expansion strips, the length of the expansion strips is three fifths of that of the plastic casing pipe, the length of the connector is one third of that of the plastic casing pipe, and the length of the threaded rod is one half of that of the plastic casing pipe. According to the expansion screw for the cement wall, size cooperation of the plastic casing pipe, the expansion strips and the connector is more reasonable, improvement of the whole strength of the screw is promoted, the expansion strips can be strutted after the threaded rod in the casing pipe is screwed, then frictional self-locking between the cement wall and the teeth is achieved, and better firmness and steadiness are achieved.
Description
technical field [0001] The invention relates to an expansion screw, more precisely, an expansion screw for cement walls. Background technique [0002] The expansion screw is composed of a screw rod and an expansion tube. The tail of the screw rod is conical, and the inner diameter of the cone is larger than the inner diameter of the expansion tube. When the nut is tightened, the screw moves outward, and the axial movement of the thread causes the cone to move, thereby forming a large positive pressure on the outer peripheral surface of the expansion tube, and the angle of the cone is small, so that the wall, the expansion tube Friction self-locking is formed between the cone and the cone, and then the fixing effect is achieved. [0003] Expansion screws generally have a thicker screw rod. When a family needs to fix a nail on the wall to hang objects, smaller expansion screws are often used. However, the expansion screws commonly used at present are not stable and easy to fa...
Claims
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IPC IPC(8): F16B13/06
CPCF16B13/066
Inventor 华文进
Owner 华文进