KR200264336Y1 - Expansion screw - Google Patents

Abstract

The expansion screw includes an expansion sleeve having a conical plug assembled to its inflatable front, a positioning sleeve screwed into the rear portion of the expansion sleeve, and a screw configured to be screwed into the positioning sleeve. The expansion sleeve includes an annular retaining groove for receiving an O-ring between its inflatable front and rear portions. The circumference of the O-ring is provided with a plurality of claws that hold the thread at the foremost end of the screw to securely hold the screw against the expansion sleeve. Thus, the screw does not rotate, thereby loosening or separating from the positioning sleeve and the expansion sleeve due to vibrations caused by any external force, ensuring that the object is securely and securely fixed to a place such as a wall through the expansion screw. .

Description

Expansion screw {EXPANSION SCREW}

Expansion screws are commonly used to fix or support objects on building structures, in particular building walls. 1 shows a conventional expansion screw A, which comprises a screw A1, a sleeve A2 and a conical plug A3. The screw A1 is screwed into the rear of the sleeve A2 and the conical plug A3 is inserted into the front opening of the inflatable front of the sleeve A2. When the sleeve A2 is pressed against the wall, the conical plug A3 at the front of the sleeve A2 is blocked by the wall and the sleeve A2 is gradually pressed towards the conical plug A3 so that the inflatable front is conical plug ( Expand along the conical surface of A3). Thus, the inflated sleeve A2 is pressed against the wall surrounding it and is firmly supported on the wall.

With the sleeve A2 firmly pressed against the wall so that the inflated front part is in intimate contact with the wall, the screw A1 screwed into the sleeve A2 is slowly rotated with respect to the sleeve A2 and eventually loosened. The vibration force applied to the building continuously separates it from the sleeve A2.

That is, while the inflatable sleeve A2 is in intimate contact with the wall, the screw A1 may loosen from the sleeve A2 and no longer effectively support the object fixed to the wall. The great potential danger with conventional expansion screws can pose a risk to the safety of the people in and around the building that surrounds them.

The main task of the present invention, therefore, is to provide an improved expansion screw that includes parts that are more tightly coupled to each other to ensure that any object is firmly and securely secured to the building structure by means of an expansion screw, thereby protecting people and property. It is.

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

Figure 2 is an exploded perspective view of the expansion screw according to a preferred embodiment of the present invention.

3 is an assembled cross-sectional view of the expansion screw of FIG.

Figure 4 is a broken assembly cross-sectional view of the expansion screw according to another embodiment of the present invention.

In order to solve the above-mentioned problems, the expansion screw of the present invention has an expansion sleeve having a conical plug assembled to its inflatable front, a positioning sleeve screwed into the rear portion of the expansion sleeve, and a screw inside the positioning sleeve. A screw configured to be inserted. The expansion sleeve includes an annular retaining groove for receiving an O-ring between its inflatable front and rear portions. The circumference of the O-ring is provided with a plurality of claws that hold the thread at the foremost end of the screw to securely hold the screw against the expansion sleeve. Thus, the screw does not rotate, thereby loosening or separating from the positioning sleeve and the expansion sleeve due to vibrations caused by any external force, ensuring that the object is securely and securely fixed to a place such as a wall through the expansion screw. .

The construction and technical means suitably applied by the present invention in order to solve the above problems will be better understood through the preferred embodiments described in detail below with reference to the accompanying drawings.

2 and 3 show an expansion screw according to a preferred embodiment of the present invention. The expansion screw of the present invention includes a screw 1, a positioning sleeve 2, an expansion sleeve 3, a conical plug 4, and an O-ring.

The screw 1 is a general standard screw member with a thread 11 formed around its shank.

The positioning sleeve 2 comprises a front part on which the outer thread 21 is provided and an inner wall surface on which the inner thread 22 is provided to engage the thread 11 of the screw 1.

The inflation sleeve 3 has a front part which can expand in a radially outward direction and a rear part which is provided with a thread 31 on the inner side to engage the outer thread 21 in the front part of the positioning sleeve 2, The positioning sleeve 2 is coupled to the rear end of the expansion sleeve 3. Inside the inflation sleeve 3 an annular retaining groove 32 is formed between the inflatable front and the inner threaded back.

The conical plug 4 is assembled to the front opening of the inflatable front of the expansion sleeve 3 for the expansion screw and is a member available on the market.

On the circumference of the o-ring 5 a plurality of claws 51 are provided and pre-positioned in the annular retaining groove 32 of the expansion sleeve 3.

The positioning sleeve 2 is coupled to the rear portion of the expansion sleeve 3 by engaging the outer thread 21 and the inner thread 31 so that the positioning sleeve 2 and the expansion ring with the O-ring 5 are engaged. Along with the sleeve 3 is fixedly positioned in the indentation groove 32 between the positioning sleeve 2 and the inflatable front of the expansion sleeve 3 to provide a semi-assembly expanded expansion screw.

In order to use the expansion screw of the present invention, the semi-assembled expansion screw is first pressed into a pilot hole (not shown) previously formed in the wall. When the expansion sleeve 3 is pressed against the conical plug 4, which is the member located in the foremost portion of the semi-assembled expansion screw, the expandable front portion of the expansion sleeve 3 expands in the radial direction and extends around the expansion sleeve 3. Pressing tightly against the wall, the semi-assembled expansion screw is firmly supported on the wall. The screw 1 is then threaded into the positioning sleeve 2 through the rear opening of the positioning sleeve 2 so that the thread 11 of the screw 1 is the inner thread 22 of the positioning sleeve 2. ) And the desired object is fixed to the wall by the expansion screw. When the screw 1 is fully screwed into the positioning sleeve 2, the thread 11 located at the foremost end of the shank 1 of the screw 1 is brought into close contact with the toe 51 of the O-ring 5, The screw 1 can be securely and stably coupled to the expansion sleeve 3. As the thread 11 engages the claws 51 of the O-ring 5, the screw 1 undesirably expands the expansion sleeve 3 even when the entire expansion screw of the present invention supported on the wall is vibrated by an external force. And loosening by rotation relative to the positioning sleeve 2. That is, the entire expansion screw can maintain a tightly assembled structure without the screws 1 being loosened or even separated from the positioning sleeve 2 and the expansion sleeve 3.

4 shows an expansion screw according to another embodiment of the present invention. In the present embodiment, the positioning sleeve 2 is deformed locally by an external force at a predetermined position, for example, an annular force pressed directly against the screw 1 screwed into the positioning sleeve 2. To form a depression, thereby allowing the screw 1 to remain securely in place in the positioning sleeve 2. The pressure exerted on the screw 1 by the annular depression on the positioning sleeve 2 is such that the entire expansion screw supported on the wall rotates relative to the positioning sleeve 2 by any vibration or It is enough to prevent loosening. Therefore, the expansion screw of the present invention is structurally safe in use.

The present invention provides an improved expansion screw that includes parts that are tighter to each other to securely and securely secure any object to a building structure, thereby protecting people and property.

Claims (2)

Standard screw size screw, A positioning sleeve comprising a front portion provided with an outer thread and an inner wall surface provided with an inner thread to engage an outer thread provided around the shank of the screw; Between a radially outwardly expandable front portion, a rear portion provided with a thread therein to engage the outer thread in the front portion of the positioning sleeve, and the inflatable front portion and a threaded rear portion inside the inner portion An expansion sleeve including an annular retaining groove formed inside the expansion sleeve, A conical plug assembled to the front opening of the inflatable front of the expansion sleeve, and An O-ring having a plurality of claws provided along its circumference and positioned in an annular retaining groove of the expansion sleeve Including, When the screw is fully screwed into the positioning sleeve, the outer thread located at the foremost end of the screw is engaged by the claw of the O-ring so that the screw is securely and securely engaged with the positioning sleeve and the expansion sleeve. To prevent the screw from rotating or loosening with respect to the positioning sleeve and the expansion sleeve by any vibration due to external forces. Expansion screw. The method of claim 1, The predetermined position of the positioning sleeve is locally deformed to form an at least radial depression that tightly presses onto the screw screwed into the positioning sleeve, thereby causing the screw to be in the positioning sleeve. An expansion screw that reliably holds in place to prevent the screw from loosening or detaching from the positioning sleeve by any vibration.