TW201719031A - Composite screw for enhancing screwing force capable of preventing wood fiber wound around thread and enhancing screwing smoothness - Google Patents

Abstract

The invention provides a composite screw for enhancing screwing force, which comprises: a stem body, a screwing head, a drilling and locking tip, a first thread, and a second thread. In which, the stem body, the first thread and the second thread are all provided with a triangular axial crossed section, so as to generate a clearance between the screw and the inner wall of the screw hole for receiving the wood fiber from the wooden workpiece. Thus, the invention may avoid the problem of the wood fiber wound around the thread and further enhance the smoothness of the screwing operation.

Description

Composite screw for lifting force

The present invention relates to a screw, and more particularly to a compound screw capable of lifting a locking force, which can reduce the resistance during locking, prevent the reverse rotation from being loosened after the locking is completed, and can reduce the threshold of the torque demand of the matched power tool.

Screws are common assembly parts used to lock two objects to each other. Because the screws are made of metal, they are often used to lock objects to wood that is softer than the screws. The existing screw has a rod body, a head portion, a tip end, and a second thread. The head and the tip are respectively formed at two ends of the rod body, and two threaded teeth are formed side by side on the rod body, and each thread has a plurality of ring segments, and the ring segments of the two thread teeth are staggered on the rod body. During the process of locking the parts into the wood, the thread cannot completely cut the wood fiber, and the complete wood fiber is tightly wound around the thread, resulting in an increase in the locking resistance, and the locking speed continues to decrease as the screw penetrates the depth of the wood.

In addition, when the locking operation is completed, the screw lacks a stop structure, and when the wood or the object is subjected to an external force, the screw is easily reversed or even detached.

Furthermore, some users use battery-type power tools to lock the screws. These power tools are limited by the power of the battery and can only be screwed with a low motor torque. When locked with the above screws. In the case of the problem that the wood fiber is caught in the ring segment of the screw, the power tool is likely to fail to complete the locking operation due to the rotation resistance of the screw exceeding the torque provided by the motor, and even cause damage to the power tool. The user must use a plug-in power tool with a large torque to successfully complete the locking operation, which results in a lack of work convenience.

The creator has improved shortcomings such as the fact that the existing screws can bite into the wood fiber during the locking operation, resulting in an increase in the locking resistance, easy to reverse the loosening after the locking, and is not conducive to the operation of the battery-type power tool with a small torque. And missing, and then create a composite screw that can enhance the locking force.

The main purpose of this creation is to provide a composite screw that can improve the locking force, which can reduce the resistance during locking, avoid the loosening of the reverse rotation after the locking is completed, and can reduce the threshold of the torque requirement of the matched power tool.

In order to achieve the above purpose, the aforementioned composite screw capable of improving the locking force includes:

a rod body having a longitudinal shape, and at least one section of the rod body has a triangular axial section, and a rounded corner is formed on each corner of the axial section of the rod triangle;

a locking head formed at an upper end of the rod;

a drill lock tip formed at a lower end of the rod and having a tapered shape;

a first thread, which is smooth and complete, is formed on the shaft in a spiral manner, and extends from the drill tip to the locking head, the first thread has a plurality of first ring segments connected together and a first triangular axial section, forming a rounded corner on each corner of the first triangular axial section;

a second thread, which is serrated, is formed on the rod in a spiral manner, and extends from the drill tip to the locking head, the second thread has a plurality of second ring segments connected, and The plurality of first ring segments and the plurality of second ring segments are arranged in an inter-phase manner, and each of the second ring segments has a plurality of teeth and a second triangular axial section at each corner of the second triangular axial section A rounded corner is formed on each of the ridges.

According to the above technical means, when the wood is locked by the above-mentioned composite screw, the axial section of the rod body, the first thread and the second thread can be used to make the composite screw during the locking process of the composite screw. A considerable gap is formed between the inner walls of the screw holes, so that the wood fibers cut by the first screw and the second screw can be accommodated in the gap between the composite screw and the inner wall of the screw hole without being entangled in the gap. The first screw or the second screw can prevent the composite screw from being subjected to the increasing resistance of the wound wood fiber during the locking process, and the problem of the locking operation cannot be smoothly performed, thereby increasing the smooth locking operation. degree. Because it can be locked to the bottom smoothly, it is not easy to reverse the loosening when the composite screw is vibrated. Moreover, since the composite screw can maintain a good and consistent low locking resistance during the locking process, even with a battery-type power tool with a low torque, the locking operation can be lightly completed, and the power tool is not subjected to excessive resistance. The fault is damaged.

The outer diameter of the second thread is smaller than the outer diameter of the first screw, and the first ring segment and the second ring segment are in a raised low state.

The extension line of the upper edge of the first ring segment of the first thread forms an angle with the extension line of the lower edge, and the angle is divided by a normal line perpendicular to the rod to form a first edge near the upper edge. An angle of intersection and a second angle of intersection adjacent the lower edge, the first angle of intersection being unequal to the second angle of intersection, resulting in an asymmetrical state of the upper and lower edges of the first thread.

The aforementioned first angle of intersection is about 20 to 25 degrees, and the second angle of intersection is about 5 to 10 degrees.

The segment of the rod body adjacent to the locking head is cylindrical, and the compound screw capable of lifting the locking force further comprises a plurality of third threading teeth, the plurality of third threading teeth being undulated to form the cylindrical shape of the rod body One paragraph.

Referring to FIG. 1 to FIG. 3 , the composite screw 1 for enhancing the locking force comprises: a rod 10 , a locking head 20 , a drill tip 30 , a first thread 50 , and a second thread 60, and a plurality of third screws 80.

Referring to FIG. 6 further, the rod body 10 is elongated, and at least one section of the rod body 10 has a triangular axial section 100, and a round corner is formed on each corner of the axial section 100 of the rod triangle. . In addition, a section of the rod body 10 adjacent to the locking head 20 is cylindrical and is connected to the aforementioned section having a triangular axial section 100 of the rod.

Referring to FIG. 4 further, the locking head 20 is formed at the upper end of the rod body 10, and a locking hole 21 is formed at the top end of the locking head 20 for inserting the head of a screwdriver.

Referring to FIG. 5 further, the drill tip 30 is formed at the lower end of the rod 10 and has a tapered shape.

The first thread 50 is smoothly and completely formed on the rod body 10 in a spiral manner, and extends from the drill collar 30 to the locking head 20, the first thread 50 having a plurality of first connected The ring segment 51 and a first triangular axial section 510 form a rounded corner on each corner of the first triangular axial section 510.

The second thread 60 is serrated, is formed on the shaft 10 in a spiral manner, and extends from the drill tip 30 to the locking head 20, the second thread 60 has a plurality of second teeth connected a segment 61, and the plurality of first ring segments 51 and the plurality of second ring segments 61 are arranged in an inter-phase manner, each second ring segment 61 having a plurality of teeth 611 and a second triangular axial section 610. A corner is formed on each corner of the second triangular axial section 610. In addition, the outer diameter of the second screw 60 is smaller than the outer diameter of the first screw 50, causing the first ring segment 51 and the second ring segment 61 to be in a low-low state, and the difference in the size of the outer diameter is further A gap is formed between the two first ring segments 51 of a thread 50.

Referring to FIG. 2, the extension line of the upper edge 513 of the first ring segment 51 of the first thread forms an angle with the extension line of the lower edge 515, and the angle is perpendicular to the normal of the rod 10. Dividing to form a first angle of intersection θ ₁ near the upper edge 513 and a second angle of intersection θ ₂ near the lower edge 515, the first angle of intersection θ ₁ and the second angle of intersection θ ₂ are not equal. The first angle of intersection is about 20 to 25 degrees, and the second angle of intersection is about 5 to 10 degrees. The first angle 513 and the lower edge of the first thread are caused by the unequal first angle of intersection θ ₁ and the second angle of intersection θ ₂ . The asymmetrical state of 515.

The plurality of third screws 80 are formed in a wavy shape on the cylindrical section of the shaft 10.

With the above technical means, this creation has the following advantages:

1. When the above-mentioned composite screw 1 is used to lock the wood, the axially-shaped rod body 10, the first screw 50 and the second screw 60 can be used to make the composite screw during the locking process of the composite screw 1. 1 and a corresponding gap is formed between the inner wall of the screw hole, thereby allowing the wood fiber cut by the first screw 50 and the second screw 60 to be accommodated in the gap between the composite screw 1 and the inner wall of the screw hole. It is not stalked and accumulated on the first screw 50 or the second screw 60, thereby avoiding the problem that the composite screw 1 is not subjected to the continuous increasing resistance of the wound wood fibers during the locking process, and the locking operation cannot be smoothly performed. , thereby increasing the smoothness of the locking operation. And because it can be locked to the end smoothly, it is not easy to reverse the loosening when the composite screw is vibrated.

2. The difference in the size of the outer diameters of the first screw 50 and the second screw 60 further forms a gap between the two first ring segments 51 of the first screw 50, which can further accommodate wood fibers and avoid wood fiber winding At the first thread 50 or the second thread 60.

3. The tooth portion 611 of the second thread 60 can shred the wood fiber to avoid it being too long to be wound around the first screw 50 and the second screw 60

4. Since the composite screw 1 can maintain a good and consistent low locking resistance during the locking process, even with a battery-type power tool with a low torque, the locking operation can be lightly completed, and the power tool is not oversized. Resistance and damage.

1‧‧‧Composite screws
10‧‧‧ rod body
100‧‧‧ rod triangular axial section
20‧‧‧Lock head
21‧‧‧Lock hole
30‧‧‧Drill lock tip
50‧‧‧First thread
51‧‧‧First ring segment
510‧‧‧First triangular axial section
513‧‧‧ upper edge
515‧‧‧ lower edge
60‧‧‧Second thread
61‧‧‧First ring segment
610‧‧‧Second triangular axial section
80‧‧‧ Third thread θ ₁ ‧‧‧first angle of intersection and θ ₂ ‧‧‧ second angle of intersection

Figure 1 is a three-dimensional appearance of the creation.

Figure 2 is a side view of the creation.

Figure 3 is a partial enlarged side view of the creation.

Figure 4 is a top view of the creation.

Figure 5 is a bottom view of the creation.

Figure 6 is a cross-sectional view of the creation of the present invention.

1‧‧‧Composite screws

10‧‧‧ rod body

20‧‧‧Lock head

21‧‧‧Lock hole

30‧‧‧Drill lock tip

50‧‧‧First thread

51‧‧‧First ring segment

60‧‧‧Second thread

61‧‧‧First ring segment

80‧‧‧ Third thread

Claims (5)

A composite screw capable of improving a locking force, comprising: a rod body having a longitudinal shape, and at least one section of the rod body having a triangular axial section, and respectively on each corner of the axial section of the rod Forming a rounded corner; a locking head formed on the upper end of the rod; a drill lock tip formed at the lower end of the rod body and having a tapered shape; a first thread, which is smooth and complete, is formed in a spiral manner And extending from the drill tip to the locking head, the first thread having a plurality of first ring segments connected and a first triangular axial section, the first triangular axial section Forming a rounded corner on each of the corners; and a second thread having a zigzag shape formed on the shaft in a spiral manner and extending from the tip of the drill to the locking head, the second thread having a plurality of connected second ring segments, wherein the plurality of first ring segments and the plurality of second ring segments are arranged in an inter-phase manner, each second ring segment having a plurality of teeth and a second triangular axial section, The respective corners of the second triangular axial section are respectively shaped A fillet. The compounding screw capable of lifting the locking force according to claim 1, wherein the outer diameter of the second thread is smaller than the outer diameter of the first thread to cause the first ring segment and the second ring segment to be in a rising state. The compounding screw capable of lifting the locking force according to claim 2, wherein an extension line of an upper edge of the first ring segment of the first thread forms an angle with an extension line of the lower edge, and the angle is perpendicular to The normal of the rod is divided to form a first angle of intersection near the upper edge and a second angle of intersection near the lower edge, the first angle of intersection being unequal to the second angle of intersection, resulting in an upper edge and a lower edge of the first thread Asymmetric state. The compounding screw capable of lifting the locking force according to claim 3, wherein the first angle of intersection is about 20 to 25 degrees, and the second angle of intersection is about 5 to 10 degrees. The composite screw capable of lifting the locking force according to claim 4, wherein a section of the rod body adjacent to the locking head is cylindrical, and the compound screw capable of lifting the locking force further comprises a plurality of third thread, the plurality of third screw The teeth are wavy and formed on the cylindrical section of the shaft.