Self-tapping screw with stable structure

Abstract

The utility model discloses a self -tapping screw with stable structure, including screw body, the countersunk head outside of screw body is equipped with one detachable ring, the ring bottom is equipped with annular slide groove, the annular slide groove inner periphery is evenly distributed with several sliders, each slider is articulated hollow support rod through universal connecting piece, the telescopic rod support foot is telescopically inserted in the hollow support rod with spring, in the non -use state, each hollow support rod opens outwards and telescopic rod support foot touches the ground simultaneously, forms the self -reliance type multi -point support around the screw body axis, makes the screw body keep vertical and waits for the nail attitude. Without using hand to hold the screw, can start to spin in, avoids the risk that hand is scratched by the tool, and the slider slides in the annular slide groove inner periphery, and the universal connecting piece allows the hollow support rod to draw in synchronously with the screw downward, and the telescopic rod support foot is retracted under the action of the compression spring, and the position of support rod is adjusted without manual, realizes the continuous operation of spin in, and the continuous operation of accomodating, and the construction efficiency is improved obviously.

Description

Technical Field

[0001] This utility model specifically relates to a self-tapping screw with a stable structure. Background Technology

[0002] Self-tapping screws are screws that have a self-tapping function, enabling them to directly cut threads into materials such as metal, plastic, or wood to achieve a fastening connection without pre-tapping.

[0003] Because self-tapping screws are not pre-tasted when in use, workers need to support the screw in its initial state to allow it to initially penetrate the object. However, this increases the risk of injury to the hands and reduces safety. Utility Model Content

[0004] The purpose of this invention is to provide a self-tapping screw with a stable structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a self-tapping screw with a stable structure, comprising a screw body, a detachable ring sleeved on the outer side of the countersunk head of the screw body, an annular groove provided at the bottom of the ring, a plurality of sliders evenly distributed in the annular groove, each slider being hinged to a hollow support rod via a universal connector, and a telescopic rod foot being inserted into the hollow support rod with a spring for telescopic extension.

[0006] When not in use, each hollow support rod opens outwards and the telescopic rod feet touch the ground simultaneously, forming a self-supporting multi-point support around the axis of the screw body, keeping the screw body in a vertical, ready-to-be-nailed posture.

[0007] Preferably, the ring is formed by interlocking two semicircular rings end to end. The corresponding ends of the two semicircular rings are respectively provided with staggered inserts and slots. The inserts are inserted into the corresponding slots to complete the splicing of the ring.

[0008] Preferably, the universal connector is a ball bearing embedded in the slider, and the ball bearing is fixedly connected to the hollow support rod, so that the hollow support rod can swing in all directions.

[0009] Preferably, the annular groove is an inverted T-shaped groove, and the slider is a corresponding inverted T-shaped slider, so that the slider can slide circumferentially within the annular groove without falling off.

[0010] Preferably, the spring is a compression spring, and the preload is set between the bottom of the hollow support rod cavity and the top of the telescopic rod foot.

[0011] Preferably, the telescopic rod support leg is a round rod structure that matches the internal cavity of the hollow support rod, and the outer diameter of the telescopic rod support leg is smaller than the inner diameter of the internal cavity of the hollow support rod, so as to realize the sliding extension and retraction of the telescopic rod support leg inside the hollow support rod.

[0012] Preferably, the slider and hollow support rod are arranged in four sets, evenly spaced at 90-degree intervals along the circumference of the ring.

[0013] The technical effects and advantages of this utility model are as follows: This self-tapping screw with a stable structure can form a self-supporting four-point (or multi-point) support when not in use, and the screw always maintains a vertical, ready-to-drive posture; workers can start screwing in without holding the screw with their hands, completely avoiding the risk of hand cuts from tools; the slider can slide circumferentially within the annular groove, and the universal connector allows the hollow support rod to retract inward synchronously as the screw descends; the telescopic rod support leg automatically retracts under the action of the compression spring, eliminating the need for manual adjustment of the support rod position throughout the process, realizing continuous operation of "screwing in and retracting at the same time", and significantly improving construction efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the hollow support rod of this utility model;

[0016] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0017] Figure 4 This is a schematic diagram of the annular groove of this utility model;

[0018] Figure 5 This is a schematic diagram of the spring structure of this utility model;

[0019] Figure 6 This utility model Figure 5 A magnified structural diagram at point B in the middle.

[0020] In the diagram: 1. Screw body; 2. Annular groove; 3. Slider; 4. Hollow support rod; 5. Telescopic rod support leg; 6. Semicircular ring; 7. Insert block; 8. Slot; 9. Ball bearing; 10. Spring. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] refer to Figures 1-6As shown, the screw includes a screw body 1. A detachable ring is fitted around the countersunk head of the screw body 1. The bottom of the ring has an annular groove 2. Several sliders 3 are evenly distributed circumferentially inside the annular groove 2. Each slider 3 is hinged to a hollow support rod 4 via a universal joint. A telescopic rod foot 5 is inserted into the hollow support rod 4 by a spring 10. In the non-use state, each hollow support rod 4 opens outward and the telescopic rod foot 5 touches the ground simultaneously, forming a self-supporting multi-point support around the axis of the screw body 1, so that the screw body 1 maintains a vertical, ready-to-be-screwed posture. When not in use, it can form a self-supporting four-point (or multi-point) support, and the screw always remains in a vertical, ready-to-be-driven position; workers can start screwing in without holding the screw with their hands, completely avoiding the risk of hand cuts from tools. The slider 3 can slide circumferentially within the annular groove 2, and the universal connector allows the hollow support rod 4 to retract inward synchronously as the screw moves down; the telescopic rod support leg 5 automatically retracts under the action of the compression spring, and no manual adjustment of the support rod position is required throughout the process, realizing continuous operation of "screwing in and retracting at the same time", which significantly improves construction efficiency.

[0023] The ring is composed of two semi-circular rings 6 that are interlocked end to end. The corresponding ends of the two semi-circular rings 6 are provided with staggered inserts 7 and slots 8. The inserts 7 are inserted into the corresponding slots 8 to complete the splicing of the ring. The mating end faces of the two semi-circular rings are provided with one insert 7 and one slot 8, which are staggered by 90 degrees. The front end of the insert 7 has a barb, and the inner wall of the slot 8 is provided with a spring-loaded locking tongue. When inserted, the barb passes over the locking tongue and makes a "click" sound, forming a self-locking mechanism. It can be assembled / disassembled with one hand without tools, improving efficiency. The universal connector is a ball bearing 9 embedded in the slider 3. The ball bearing 9 is fixedly connected to the hollow support rod 4, allowing the hollow support rod 4 to swing in all directions. The ball bearing 9 is made of stainless steel. The bottom of the slider 3 is machined with a ball socket and a wear-resistant ring is set at the opening of the ball socket. The top of the hollow support rod 4 is equipped with a ball handle, which is laser-spot welded to the ball bearing 9. Food-grade grease is injected into the ball socket. The universal swing angle is greater than 30 degrees. The hollow support rod 4 can automatically adjust its spatial posture as the screw sinks, avoiding tension. The annular groove 2 is an inverted T-shaped annular groove, and the slider 3 is a corresponding inverted T-shaped slider 3, which enables the slider 3 to slide circumferentially in the annular groove 2 without falling off. The width of the inverted T-shaped annular groove 2 opening is smaller than the width of the groove bottom, and the transverse flange of the slider 3 is covered by the groove bottom. Spring 10 is a compression spring, preloaded between the bottom of the inner cavity of the hollow support rod 4 and the top of the telescopic rod foot 5. The compression spring is made of rectangular cross-section stainless steel wire, and the gap between the outer diameter of spring 10 and the inner cavity of the hollow support rod 4 is small. Both ends of spring 10 are ground flat and sealed. A positioning boss for spring 10 is provided at the top of the telescopic rod foot 5. The height of the boss is one-third of the free height of spring 10. The ground flat ends and the positioning boss prevent the spring 10 from bending when compressed, thus improving its lifespan. The increased stiffness of the rectangular wire provides greater rebound force for the same length, ensuring that the foot always stays in contact with the ground. The telescopic rod foot 5 is a round rod structure that matches the inner cavity of the hollow support rod 4. The outer diameter of the telescopic rod foot 5 is smaller than the inner diameter of the inner cavity of the hollow support rod 4, enabling the telescopic rod foot 5 to slide and extend within the hollow support rod 4. Four sets of sliders 3 and hollow support rods 4 are arranged evenly at 90-degree intervals along the circumference of the ring. The four sets of sliders 3 and hollow support rods 4 are arranged in a cross shape, and the arc length between adjacent sliders 3 is equal to one-quarter of the circumference. The connection point between slider 3 and hollow support rod 4 is lower than the ring, forming an inward contraction. The inward contraction layout ensures that the outer contour of hollow support rod 4 does not exceed the outer edge of the ring after being folded. The symmetrical distribution ensures that each rod is subjected to uniform force, avoids one-sided wear, and extends service life. It should be noted that slider 3 and the slide groove are circumferentially free. Slider 3 can slide arbitrarily in the annular slide groove 2, while the support rod, the ground, and the human body do not impose circumferential constraints on slider 3. Rotation is achieved by slider 3 sliding in the groove, and folding is achieved by slider 3 sliding radially inward, without interference. This allows the screw to rotate freely and the support system to fold smoothly and synchronously.

[0024] In use, place two semicircular rings 6 on the outside of the countersunk screw head, and push the corresponding inserts 7 and slots 8 into the screw head in a staggered manner. A "click" sound indicates that the rings are self-locking. Place the screw vertically on the surface to be installed. The four hollow support rods 4 will automatically open outward under gravity. The telescopic rod legs 5 will simultaneously touch the ground under the push of the compression spring, forming a cross-shaped four-point support. The screw will remain in a vertical position and can be driven without manual assistance. Use an electric screwdriver or manual tool to apply downward pressure to the screw head and rotate it. The screw will begin to cut threads. The slider 3 will slide circumferentially along the inverted T-shaped annular groove 2. The universal ball bearings 9 will allow the hollow support rods 4 to retract inward as the screw sinks, automatically following the movement throughout. As the screw continues to drill in, the hollow support rods 4 and the telescopic rod legs 5 will continuously retract until the rings are close to the workpiece surface. At this point, the support assembly will be fully retracted and will no longer affect the final countersunk screw engagement.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model.

Claims

1. A self-tapping screw with a stable structure, comprising a screw body (1), characterized in that: A detachable ring is fitted on the outer side of the countersunk head of the screw body (1). The bottom of the ring is provided with an annular groove (2). Several sliders (3) are evenly distributed in the annular groove (2). Each slider (3) is hinged to a hollow support rod (4) via a universal connector. A telescopic rod support foot (5) is inserted into the hollow support rod (4) in a telescopic manner with a spring (10). In the non-use state, each hollow support rod (4) opens outward and the telescopic rod support foot (5) touches the ground at the same time, forming a self-supporting multi-point support around the axis of the screw body (1), so that the screw body (1) maintains a vertical waiting posture.

2. The self-tapping screw with a stable structure according to claim 1, characterized in that: The ring is formed by interlocking two semicircular rings (6) end to end. The corresponding ends of the two semicircular rings (6) are respectively provided with staggered inserts (7) and slots (8). The inserts (7) are inserted into the corresponding slots (8) to complete the splicing of the ring.

3. The self-tapping screw with a stable structure according to claim 1, characterized in that: The universal connector is a ball (9) embedded in the slider (3). The ball (9) is fixed to the hollow support rod (4), so that the hollow support rod (4) can swing in all directions.

4. The self-tapping screw with a stable structure according to claim 1, characterized in that: The annular groove (2) is an inverted T-shaped annular groove, and the slider (3) is an inverted T-shaped slider (3), so that the slider (3) can slide circumferentially in the annular groove (2) without falling off.

5. The self-tapping screw with a stable structure according to claim 1, characterized in that: The spring (10) is a compression spring, and the preload is set between the bottom of the inner cavity of the hollow support rod (4) and the top of the telescopic rod foot (5).

6. The self-tapping screw with a stable structure according to claim 1, characterized in that: The telescopic rod support leg (5) is a round rod structure that matches the internal cavity of the hollow support rod (4). The outer diameter of the telescopic rod support leg (5) is smaller than the inner diameter of the internal cavity of the hollow support rod (4), so as to realize the sliding extension and retraction of the telescopic rod support leg (5) inside the hollow support rod (4).

7. The self-tapping screw with a stable structure according to claim 1, characterized in that: The slider (3) and hollow support rod (4) are arranged in four sets, evenly spaced at 90-degree intervals along the circumference of the ring.

Images