Expansion screw for hollow brick

Abstract

The expansion screw for the hollow brick comprises an expansion pipe, a screw rod, a plurality of check blocks, pins, taper sleeves and nuts, the pins are arranged in the axial direction of the screw rod side by side at intervals, the two ends of the pins extend out of the circumferential face of the screw rod, torsional springs are arranged at the two ends of the pins in a sleeved mode, and the two check blocks are arranged on the two sides of the screw rod in a mirror symmetry mode. The screw rod is sleeved with the expansion pipe and movably connected with the end of the pin, the torsional spring abuts against the inner side of the check block, the expansion pipe and the two taper sleeves are arranged on the screw rod in a sleeving mode, the two taper sleeves abut against the front end and the rear end of the expansion pipe, and the nut is screwed at the end of the screw rod and movably abuts against the front ends of the taper sleeves. By means of force provided by the torsion spring, the check block can form a barb structure in the brick body and firmly abut against the inner wall of the brick body, the contact area between the check block and the brick body is increased, the bearing capacity is further improved, and reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion screws, in particular to an expansion screw for hollow bricks. Background Art

[0002] At present, most high-rise buildings adopt frame structures, and non-load-bearing walls are made of hollow bricks, whose overall strength is much lower than that of solid walls. Due to practical needs, in many cases, it is necessary to operate or fix facilities on such hollow walls (for example, installing air conditioner outdoor units, fire climbing and rescue, etc.), and many situations require the use of external walls for force. Traditional expansion screws only rely on the expansion of the tail, with too little contact area, unable to achieve large load-bearing and unable to withstand large impact forces, which easily leads to safety hazards. Utility Model Content

[0003] Based on this, it is necessary to provide an expansion screw for hollow bricks to address the above problems.

[0004] An expansion screw for hollow bricks comprises an expansion tube, a screw, a plurality of blocks, a pin, a tapered sleeve and a nut. The plurality of pins are arranged side by side and spaced along the axial direction of the screw, and the two ends of the pins are extended and arranged outside the circumference of the screw. A torsion spring is sleeved on the two ends of the pin. Two blocks are mirror-symmetrically arranged on both sides of the screw and movably connected to the ends of the pin. The torsion spring abuts against the inner side of the block. The expansion tube and two tapered sleeves are both sleeved on the screw. The two tapered sleeves abut against the front and rear ends of the expansion tube. The nut is screwed on the end of the screw and movably abuts against the front end of the tapered sleeve.

[0005] Preferably, the front end of the expansion tube is provided with a groove along the axial direction.

[0006] Preferably, a fixing ear is provided at one end of the stopper, and the end of the pin passes through the fixing ear, and the other end of the stopper has an outward-turned ear folded away from the screw rod.

[0007] The utility model is beneficial in that the force provided by the torsion spring is used to enable the stopper to form a barbed structure inside the brick body, firmly abutting against the inner wall of the brick body, thereby increasing the contact area between the block and the brick body, thereby increasing the load-bearing capacity and improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a three-dimensional schematic diagram of an expansion screw for a hollow brick according to one embodiment;

[0009] Figure 2 This is a schematic diagram of the explosion of an expansion screw for hollow bricks. DETAILED DESCRIPTION

[0010] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0011] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0012] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0013] like Figures 1-2 As shown, an expansion screw for hollow bricks comprises an expansion tube 1, a screw rod 2, a plurality of blocks 3, a pin 4, a tapered sleeve 5 and a nut 6. The plurality of pins 4 are arranged side by side and spaced along the axial direction of the screw rod 2, and the two ends of the pin 4 are extended and arranged outside the circumference of the screw rod 2, a torsion spring 7 is sleeved on the two ends of the pin 4, two blocks 3 are mirror-symmetrically arranged on both sides of the screw rod 2, and are movably connected to the ends of the pin 4, the torsion spring 7 abuts against the inner side of the block 3, the expansion tube 1 and the two tapered sleeves 5 are both sleeved on the screw rod 2, the two tapered sleeves 5 abut against the front and rear ends of the expansion tube 1, and the nut 6 is screwed on the end of the screw rod 2 and movably abuts against the front end of the tapered sleeve 5. Specifically, when in use, a hole is opened on the hollow brick, and the screw 2 is inserted into the hollow brick. When the block 3 is not inserted, it is subjected to the torsion spring force provided by the torsion spring 7. The two blocks 3 are open. After insertion, they are contracted and closed by the holes in the brick body to form a barb shape, so that they can firmly hook the solid wall, thereby increasing the contact area and the carrying capacity. In addition, one end of the screw 2 with the nut 6 extends outside the brick body for hanging heavy objects when climbing. We screw the nut 6, and then move the cone sleeve 5, firmly against the pipe mouth of the expansion tube 1, and push it toward one side of the wall, which can make the block 3 turn outward and open a larger angle to increase the contact area between the overall screw and the brick body and increase the carrying capacity.

[0014] like Figures 1-2 As shown, the front end of the expansion tube 1 is provided with a slot 11 in the axial direction. When the nut 6 is screwed, the nut 6 moves along the screw rod 2 and abuts against the cone sleeve 5. The cone sleeve 5 blocks the front port of the expansion tube 1 by the pressure provided by the nut 6, and expands the front end of the expansion tube 1, thereby enhancing the force between the expansion tube 1 and the brick body, preventing it from being brought out during climbing, increasing the bearing capacity, and improving reliability.

[0015] like Figures 1-2 As shown, a fixing ear 31 is provided at one end of the block 3, and the end of the pin 4 passes through the fixing ear 31, and the other end of the block 3 has an outward-turned ear 32 folded away from the screw 2. Specifically, the pin 4 passes through the fixing ear 31, so that the block 3 can rotate around the fixing ear 31. When the expansion screw is not inserted into the hollow brick, the torsion spring 7 provides a torsion spring force, so that the two blocks 3 are opened and away from each other. After being inserted into the brick body, the block 3 is gathered. Due to the existence of the torsion spring 7, the two mirror-symmetrical blocks 3 are V-shaped and stuck in the brick body, and the existence of the outward-turned ear 32 can be engaged with the concave and convex inner wall of the brick body to prevent slipping. When one end of the screw 2 leaks out of the brick body and is pulled outward by force, the block 3 plays the role of "barb" engagement, which can prevent the screw 2 from being pulled out, thereby improving the overall stability of the screw.

[0016] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An expansion screw for hollow bricks, characterized in that: It includes an expansion tube, a screw, a plurality of blocks, a pin, a cone sleeve and a nut. The plurality of pins are arranged side by side and spaced along the axial direction of the screw, and the two ends of the pins are extended outside the circumference of the screw. A torsion spring is sleeved on both ends of the pin. Two blocks are mirror-symmetrically arranged on both sides of the screw and movably connected to the ends of the pin. The torsion spring abuts against the inner side of the block. The expansion tube and two cone sleeves are both sleeved on the screw. The two cone sleeves abut against the front and rear ends of the expansion tube. The nut is screwed on the end of the screw and movably abuts against the front end of the cone sleeve.

2. An expansion screw for hollow bricks as claimed in claim 1, characterized in that: The front end of the expansion tube is provided with a slot along the axial direction.

3. An expansion screw for hollow bricks as claimed in claim 1, characterized in that: One end of the stopper is provided with a fixing ear, the end of the pin passes through the fixing ear, and the other end of the stopper is provided with an outward-turned ear folded away from the screw rod.

Images