JPH0410A - Screw - Google Patents

Abstract

PURPOSE:To increase strength of a screw ridge, improve contact/fastening strength, and prevent loosening by forming U-shaped housing receiving parts in both the horizontal and vertical directions on a side part of a screw thread all over the periphery of a shaft, and also forming a projecting housing surface and sharp screw thread in order to bits a member. CONSTITUTION:A sharp ridge is formed on a top face of a vertical housing surface 3 on a horizontal shaft body 4 to form a screw thread 8. U-shaped member housing receiving parts 1 are formed on a relative surface of the housing surface 3. The thickness and height of the screw thread 8 are increased, and stagle contact/fastening force is obtained in the member housing receiving parts 1 provided on parts forming the ridge 2. Loosening is then prevented by a space of a connection between a head 6 and a shaft body 4.

Description

[Detailed Description of the Invention] [Industrial Application Field] 100 has a narrow shape. When the screw tip shape is thin like this, the tip is sharp, so the screw thread is easily damaged and the strength is weak, and the screw sometimes loosens and comes out.

[Problem to be solved by the invention]

Conventionally, the thread width was thin, so the strength for joining and fastening parts was weak, and the threads were easily damaged, making it impossible to join and fasten parts with screws, and when used for a long time, the screws could loosen and come out of the parts. . Conventional screws have the disadvantage that they tend to come off in places where strong vibrations are applied.

The purpose of the present invention was to solve these conventional drawbacks, and to increase the strength of the screw thread, and to prevent the screws from being damaged or loosened, a housing receptacle is provided on the member, and the member is attached to the housing receptacle. To provide a screw capable of obtaining a strong joining and fastening force for housing an insertion member.

[Means to solve the problem]

In the present invention, the strength of the screw is increased by providing a receiving portion for storing the member on the axis of the screw and at the same time widening the width of the spiral turn of the screw. For this purpose, a U-shaped member storage receiving portion is provided on the opposite surface of the spiral portion of the screw. In order to widen the width of the screw and set up a receptacle for the component, the thread should be gradually raised from the tip of the screw to a certain point, and then pass that point. An axial thread was formed by making the height constant.

Since the width of the thread can be made wider, the thread can bite into the member without being deformed, and the member can now be fastened to the U-shaped storage receptacle formed by the thread. The U-shaped storage receptacle that forms a thread on the shaft diameter has an axially
Let it be vertically oriented.

In this way, the member is bent and twisted by the screw thread to bind the member to the storage surface. By selecting the material of the screw according to the type of member in this manner, a strong tightening force can be obtained with the screw of the present invention.

By providing a space between the shaft and head of the screw, when the screw is tightened, the mounting member is received by the U-shaped storage surface on one side, and the member is pressurized by the head of the screw on the other side. Therefore, the member is subjected to a bending force, so that the member can be more firmly fixed to the storage receiving part.

[Effect]

By providing a storage receptacle for a U-shaped member around the entire circumference of the helix of the screw shaft, the spring on the top of one helix hits the tip of the screw and cuts the screw into the member, while at the same time cutting the screw into the member on the other side. The member is then inserted into the U-shaped storage receiving portion to stably and firmly fix the member.

In addition, if a space is provided in the part of the screw that is connected to the screw shaft, the member will be bent between the part of the storage surface that enters the storage receptacle and the side surface of the head of the screw. Since the member is pressurized by a spring action, the member can be stably and firmly fixed.

〔Example〕

The present invention is shown in FIGS. 1 to 6. In FIG. 1, a shaft body 4 having a square head 6 is provided with a spiral turn 8. The spiral turn 8
A sharp screw thread 2 is provided on the top surface with the shaft body 4 being horizontal and the storage surface 3 being vertical. A U-shaped member storage receiving portion 1 is provided on the opposite surface of the storage surface 3. The screw thread 8 is formed with a plurality of storage receiving parts 1, and the storage surface 3 is gradually lowered at the tip of the shaft 4 until the height of the screw thread 5 is lowered at the tip of the shaft 4. , 5a become even lower.

In the screw configured in this way, the portion forming the screw thread 2 or the thread threads 5, 5a is coated to harden the surface in order to cut into the mating member, or By performing carburizing hardening, induction hardening, or the like, grooves are cut in the mating member to enable the members to be joined and fastened.

To attach the members 7a and 7 as shown in FIG. When the shaft body 4 is rotated, the screw thread 5a bites into the members 7, 7a, and after passing, the thread 5 bites first, and after passing, as the thread 2 gradually becomes higher, the screw threads are inserted into the members 7, 7a. The threads are biting into each other, and at the screw thread 2, the members 7 and 7a are biting into the receiving part 1 on one side, and biting into the member on the other side. In this respect as well, the member will not come out even if the member is not fully tightened due to the bending force.

Therefore, in the final stage of the joining and fastening force of the members, a screw is obtained in which the screw cannot be pulled out from the member due to the receiving part of the screw and the top of the thread 2, as shown in FIG.

FIGS. 1 and 2 show an embodiment of the present invention, in which the U-shaped component storage receiving portion and the pitch of the spiral, the height of the storage surface, and the shape of the screw thread are set depending on the component.

In Fig. 2, the parts are connected and fastened by the screw head 6a and two screw threads, but in order to join and fasten the parts, it is necessary to round the connecting part between the screw head 6a and the shaft body 4, or This may cause problems such as the vertical plane 10 of the head not being aligned with the joining surface, so that the fastening force when joining the screws may not be applied to the members.

When a space 9 is provided in the connecting part between the screw head 6a and the shaft body 4 as shown in FIG. 3, the vertical surface 12 of the screw head 11 and the thread 2a
When the screw is tightened with the member caught on the thread 2a, the members 7b and 7c receive a bending force due to the engagement between the thread 2a and the head 11. is firmly fixed.

FIG. 4 shows that when a protrusion 13 is provided on the screw head 11 against the member pressing surface 12, the protrusion 13 bites into the member, thereby further pressing the member. Furthermore, by providing the protrusions 13 in double or triple layers on the member pressing surface 12, the effect of preventing loosening of the screw can be enhanced. This effect is particularly great when the material is soft.

In addition, in FIG. 6, if the notch 14 is provided in the protrusion 13, the member of the notch 14 will return and protrude. If a corner is provided on 13, the protrusion 1 will catch on the member.
3 prevents the screw from turning and prevents the screw from loosening. By doing so, it is possible to prevent the screw from loosening caused by vibration or the like. The material for forming the screw is selected depending on the member.

〔Effect of the invention〕

In the present invention, a stable joining and fastening force of the screw can be obtained by increasing the width of the helical turn of the screw and increasing the height of the helical turn, and by providing a member storage receiving part in the part where the thread is formed.

Furthermore, by providing a space between the screw head and the shaft body, a screw that can further increase the joining and fastening force can be obtained, and the screw will not loosen even when used in areas with strong vibrations. A screw that can be prevented is obtained.

[Brief explanation of drawings]

The drawings show the present invention from Fig. 1 to Fig. 6, Fig. 1 is a front view of the screw showing a partial cross section, Fig. 2 is a diagram of the screw showing the state in which the members are joined and fastened, and Fig. 3 is the screw Fig. 4 is a side view showing a part where a protrusion is provided on the head, and Fig. 5 shows the protrusion of the head in Fig. 4. FIG. 6 is a diagram showing a portion where a notch is provided in the protrusion of the head of FIG. 5, and FIG. 7 is a front view showing a state in which members are joined and fastened with conventional screws. be. 1... Storage receiver, 2... Screw out, 3... Storage surface,
4... Shaft body, 5, 5a... Thread height, 6, 6a
, 11...Head, 7, 7 a, 7 b, 7
c--Member, 8... Spiral turn, 9... Space part, 10.
12... Vertical surface, 13... Projection, 14... Notch. Figure 1

Claims (1)

[Claims] 1. In a screw having a shaft and a head, a U-shaped storage receptacle is provided in the horizontal and vertical directions on the side of the spiral around the entire circumference of the shaft. A screw characterized by having a storage surface protruding from the top and a sharp spiral at the tip of the screw that bites into the member. 2. A screw having a shaft and a head, characterized in that a space is provided at the head at the base of the head coupled to the shaft. 3. A screw having a shaft and a head, characterized in that a protrusion is provided circumferentially on a member pressing surface of the head coupled to the shaft. 4. The screw according to claim 3, characterized in that a notch is provided in the protrusion provided on the member pressing surface.